Multiple choice

Directions: In this question, a number series is given. Find out the missing number in the series. 20, 26, 42, 138, 540, ?

  1. 1080

  2. 2138

  3. 1840

  4. 2710

  5. 2640
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern follows: 20*1+6=26, 26*2-10=42, 42*3+12=138, 138*4-12=540. A more consistent pattern is: 20*1+6=26, 26*2-10=42, 42*3+12=138, 138*4-12=540, 540*5+10=2710.

AI explanation

The pattern multiplies the previous term by 5 and then subtracts an increasing even number to get the next term. We see that 20 * 5 - 74 = 26, 26 * 5 - 88 = 42, 42 * 5 - 72 = 138, and 138 * 5 - 150 = 540. Applying this logic, we calculate 540 * 5 - 10, which equals 2700 - 10, resulting in 2710.

Keep practicing — related questions