What number would replace question mark (?) in the series given below: 2, 9, 20, 35, 54, 77, ?, 135
- AOption (a)
131
- BOption (b)
104
- COption (c)
125
- DOption (d)
98
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Correct answer
104
Why this answer is correct
The logic followed here is:
{N + (N + 1)} x (N + 2)
⇒ (0 + 1) x 2 = 2
⇒ (1 + 2) x 3 = 9
⇒ (2 + 3) x 4 = 20
⇒ (3 + 4) x 5 = 35
⇒ (4 + 5) x 6 = 54
⇒ (5 + 6) x 7 = 77
⇒ (6 + 7) x 8 = 104
∴ The missing number is 104.