Permutation and Combination Questions

Multiple choice
  1. Both Statement I and Statement II are true.

  2. Both Statement I and Statement II are false.

  3. Statement I is true, but Statement II is false.

  4. Statement I is false, but Statement II is true.

Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice

Passage

A cricket team of 11 players is to be performed from a group of 15 players- A.B,C,D,E,F,G,H,I,J,K,L,M,N,O. Among the players A,D,K,L,M,N and O are batsman ;B,C,E,F,G and H are bowlers; I and J are wicketkeepers. It is also known that. I. The team must have at least 5 batsmen and exactly 1 wicketkeeper. II. H can be selected only if B is selected. III. F can be selected only if both G and N are selected. IV. If I is selected, then F is also selected. V. K and M cannot be selected together for the team. The same is true for B and G.

In how many ways can the team be formed?

  1. 3

  2. 4

  3. 5

  4. 6

Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice

Passage

A supermarket has to place 12 items (coded A to L) in shelves numbered 1 to 16. Five of these items are types of biscuits, three are types of candies and the rest are types of savouries. Only one item can be kept in a shelf. Items are to be placed such that all items of same type are clustered together with no empty shelf between items of the same type and at least one empty shelf between two different types of items. At most two empty shelves can have consecutive numbers. The following additional facts are known. 1. A and B are to be placed in consecutively numbered shelves in increasing order. 2. I and J are to be placed in consecutively numbered shelves both higher numbered than the shelves in which A and B are kept. 3. D, E and F are savouries and are to be placed in consecutively numbered shelves in increasing order after all the biscuits and candies. 4. K is to be placed in shelf number 16. 5. L and J are items of the same type, while H is an item of a different type. 6. C is a candy and is to be placed in a shelf preceded by two empty shelve s. 7. L is to be placed in a shelf preceded by exactly one empty shelf.

In how many different ways can the items be arranged on the shelves?

  1. 8

  2. 4

  3. 2

  4. 1

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is a complex constraint satisfaction problem. Based on the rules provided, there are 8 valid configurations for placing the items under the specified constraints.

Multiple choice

Passage

Following questions are based on the 5 given groups, each consisting of a letter word preceded by a 4-digit number. 3145 CAMP, 7314 THIN, 2385 SAME, 2318 STAR, 4176 ABLE

If all letter within same word are arranged inalphabetical order and thus newly formed words arearranged in dictionary order then, how many lettersare there in English alphabet between 3rd letter ofsecond word to 2nd letter of fourth word (as perascending order) ?

  1. 8

  2. 6

  3. 5

  4. 4

  5. 3

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Words: CAMP, THIN, SAME, STAR, ABLE. Alphabetical order: ACMP, HINT, AEMS, ARST, ABEL. Dictionary order: ABEL, ACMP, AEMS, ARST, HINT. 2nd word is ACMP (3rd letter is M). 4th word is ARST (2nd letter is R). Letters between M and R are N, O, P, Q (4 letters).

Multiple choice

Passage

Directions for Questions 44 to 47 : Read the given information and the answer the questions that follow. 4 boys: Amir, Biswa, Chintan & Dushyant and 4 girls: Ananya, Bina, Chetana & Divya sit around a circular table facing the centre of the table, such that no 2 girls sit adjacent to each other. Amir sits adjacent to Bina but not to Chetana. Biswa sits adjacent to Chetana but not to Divya. Chintan sits adjacent to Divya but not to Ananya. Dushyant sits adjacent to Ananya but not to Bina.

How many different arrangements are possible?

  1. 2

  2. 4

  3. 6

  4. 8

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

By placing the 4 boys and 4 girls around a circular table such that no two girls are adjacent, the boys and girls must alternate. Given the specific adjacency constraints (Amir adjacent to Bina, etc.), there are only 2 valid circular arrangements that satisfy all conditions.

Multiple choice

Passage

Directions: Read the following information carefully to answer the question that follows: MARKS OBTAINED BY A CLASS OF 46 STUDENTS IN A TEST OUT OF 100 Number of Children Marks 4 <10 12 <20 21 <30 28 <40 36 <50 42 <60 46 <70 (Assume each student got integral marks)

In how many ways 3 students chosen at random from the class have y marks, where 30 ≤ y < 60?

  1. 1771

  2. 1540

  3. 1330

  4. 1140

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The number of students with marks y where 30 <= y < 60 corresponds to the range 30 to 60. From the table: students < 40 is 28, < 50 is 36, < 60 is 42. So, students in [30, 40) is 28-21=7, [40, 50) is 36-28=8, [50, 60) is 42-36=6. Total students = 7+8+6 = 21. Ways to choose 3 = 21C3 = (21*20*19)/(3*2*1) = 7*10*19 = 1330.

Multiple choice

Passage

DIRECTIONS: Study the information given below and answer the adjacent questions. A team, consisting of five members, needs to be selected from ten participants to represent their school in the inter-school quiz competition. Among those ten participants, there are four boys – Sayak, Vinay, Rahul and Sanjoy, and at least two of them must be selected. The name of the girls is Poushali, Ankita, Varsha, Winnie, Moumita and Zara. Further it is known that, (I) If Sayak is selected, then neither Moumita nor Zara can be selected. (II) If Vinay is selected, then Poushali must be selected, but Winnie should not be selected. (III) If Rahul is selected, then neither Ankita nor Varsha can be selected.

If Sayak and Sanjoy are selected, then in how many ways can the team be formed?

  1. 5

  2. 10

  3. 9

  4. 8

Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice

Passage

DIRECTIONS: Study the information given below and answer the adjacent questions. A team, consisting of five members, needs to be selected from ten participants to represent their school in the inter-school quiz competition. Among those ten participants, there are four boys – Sayak, Vinay, Rahul and Sanjoy, and at least two of them must be selected. The name of the girls is Poushali, Ankita, Varsha, Winnie, Moumita and Zara. Further it is known that, (I) If Sayak is selected, then neither Moumita nor Zara can be selected. (II) If Vinay is selected, then Poushali must be selected, but Winnie should not be selected. (III) If Rahul is selected, then neither Ankita nor Varsha can be selected.

In how many ways can a team consisting of exactly three boys be formed?

  1. 4

  2. 5

  3. 6

  4. 7

Reveal answer Fill a bubble to check yourself
B Correct answer