Skip to main contentSkip to solution

Choose the correct alternative from the given options that will replace the question mark (?) in the following series:

7, 8, 18, 57, ?, 1165

Solution

✅ Correct Option: 2

Looking at the series: 7, 8, 18, 57, ?, 1165

Let me examine the relationship between consecutive terms:

7×1+1=87 \times 1 + 1 = 8

8×2+2=188 \times 2 + 2 = 18

18×3+3=5718 \times 3 + 3 = 57

The pattern shows each term is obtained by multiplying the previous term by an increasing multiplier (1, 2, 3, ...) and then adding that same multiplier.


Continuing the pattern:

57×4+4=228+4=23257 \times 4 + 4 = 228 + 4 = 232


Confirming with the next term:

232×5+5=1160+5=1165232 \times 5 + 5 = 1160 + 5 = 1165 ✓

This matches the given term in the series.


Therefore, the missing number is 232.

The correct answer is Option 2.

Keyboard Shortcuts

  • Left arrow: Previous question
  • Right arrow: Next question
  • S key: Jump to solution
  • Q key: Jump to question