Quantitative Aptitude

Number Series

2,662 Questions
All First differences and arithmetic progressions 812 Successive multiplication or division 429 Step-wise calculations 349 Squares and cubes based 338 Separate alternate positions 241 Inter-term operations 144 Mixed-operation rules 138 Unconventional pattern solving 74 Fractional and decimal operations 60 Prime number based 54 Digit operations 23

Number Series Questions

Multiple choice

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series. 72, 65.7, ?, 53.1, 46.8

  1. 59.4

  2. 60.4

  3. 59.3

  4. 60.3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The sequence is 72, 65.7, ?, 53.1, 46.8. The difference between 72 and 65.7 is 6.3. The difference between 53.1 and 46.8 is 6.3. Assuming a constant difference of 6.3, the missing term is 65.7 - 6.3 = 59.4. Checking: 59.4 - 6.3 = 53.1, which matches.

Multiple choice

A number series is given below, in which only one number is wrong. Find out the wrong number. 17, 35, 57, 80, 105, 132, 161, 192

  1. 105

  2. 80

  3. 57

  4. 35

  5. 17
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The differences between consecutive terms in the series are 18, 22, 23, 25, 27, 29, and 31. The differences from the third term onward (23, 25, 27, 29, 31) form a sequence of consecutive odd numbers. Extending this pattern backward, the first two differences should be 19 and 21 instead of 18 and 22, which means the second term should be 17 + 19 = 36 instead of 35.