Multiple choice

Directions: In the following number series, one number is wrong. Find out the wrong number. 10, 15, 30, 75, 250, 787.5, 3150

  1. 30

  2. 75

  3. 250

  4. 787.5

  5. 3,150
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pattern: 10*1.5=15, 15*2=30, 30*2.5=75, 75*3=225, 225*3.5=787.5, 787.5*4=3150. The term 250 is incorrect; it should be 225.

AI explanation

The series follows the pattern of multiplying by 1.5, 2, 2.5, and so forth. Following this logic, 10 × 1.5 = 15, 15 × 2 = 30, 30 × 2.5 = 75, 75 × 3 = 225 (not 250), 225 × 3.5 = 787.5, and 787.5 × 4 = 3150. The wrong number is 250.

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