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

Directions: Find the missing term in the following series. 11, 6, 7, 12, ?

  1. 9

  2. 16

  3. 26

  4. 32

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series follows a pattern of alternating operations: 11 - 5 = 6, 6 + 1 = 7, 7 + 5 = 12. Alternatively, looking at the differences: -5, +1, +5. This does not form a standard simple progression, but the provided answer 26 suggests a pattern of (11*0.5)+0.5=6, (6*1)+1=7, (7*1.5)+1.5=12, (12*2)+2=26.

Multiple choice

Find the next term of the series. 22, 165, 2475, 55687.5, __

  1. 1670625

  2. 1670650

  3. 1670675

  4. 1670700

  5. 1670725
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The series follows the pattern: 22 * 7.5 = 165; 165 * 15 = 2475; 2475 * 22.5 = 55687.5. The multipliers are increasing by 7.5 each time (7.5, 15, 22.5), so the next multiplier is 30. 55687.5 * 30 = 1670625.

Multiple choice

Directions: In the following question, a number series is given, in which one number is missing. Find out the missing number. 210, 220, 235, 260, 300, ?

  1. 360

  2. 340

  3. 330

  4. 320

  5. 300
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The differences between consecutive terms are: 220-210=10, 235-220=15, 260-235=25, 300-260=40. The differences of these differences are: 15-10=5, 25-15=10, 40-25=15. The next difference should be 20, so the next term difference is 40+20=60. The next number is 300+60=360.