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: In the following number series one number is wrong. Find out the wrong number. 7744, 6848, 6200, 6176, 6064, 6008, 5980, 5966

  1. 6848

  2. 6200

  3. 6008

  4. 5980

  5. 5966
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern is subtracting decreasing powers of 2 or specific increments. 7744 - 896 = 6848; 6848 - 648 = 6200; 6200 - 24 = 6176. The pattern is inconsistent; checking the differences: 896, 648, 24, 112, 56, 28, 14. The sequence of differences is halved starting from 112. Thus, 6200 should be 6176 + 112 = 6288.

Multiple choice

Directions: In the following number series one number is wrong. Find out the wrong number. 2250, 2200, 2050, 1600, 450, -3800

  1. 2200

  2. 2050

  3. 1600

  4. 450

  5. 2250
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is a subtraction series: 2250 - 50 = 2200; 2200 - 150 = 2050; 2050 - 450 = 1600; 1600 - 1350 = 250 (not 450). The differences are 50, 150, 450, 1350 (multiplying by 3). Thus, 1600 - 1350 = 250, and 250 - 4050 = -3800. The number 450 is incorrect.

Multiple choice

Directions: In the following number series, one number is wrong. Find out the wrong number. 7, 17, 45, 145, 601, 3019, 18129

  1. 601

  2. 17

  3. 145

  4. 3019

  5. 18129
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is: 7*2+3=17, 17*3-6=45, 45*4+9=201 (not 145). The sequence follows x*n + (n-1)*3 or similar. Checking 145: 45*3+10=145 is wrong. The sequence is 7, 17, 45, 145, 601... 7*1+10=17, 17*2+11=45, 45*3+10=145, 145*4+41=601. The pattern is inconsistent at 145.