Find the missing number in the given series:

2, 6, 15, 35, 77, ?

This question was previously asked in

IBPS PO 10 Oct 2020 Prelims Memory Based Paper Shift 2

- 163
- 196
- 165
- 198
- 199

Option 3 : 165

Calculation:

The pattern followed here is:

⇒ 2 × 2 + 2 = 6

⇒ 6 × 2 + 3 = 15

⇒ 15 × 2 + 5 = 35

⇒ 35 × 2 + 7 = 77

⇒ 77 × 2 + 11 = **165**

∴ required value of ? = 165

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