Discussion

Explanation:

The logic is: n × (n + 3) + 1

∴ 9 × (9 + 3) + 1 = 9 × 12 + 1 = 109
∴ 7 × (7 + 3) + 1 = 7 × 10 + 1 = 71

⇒ 13 × (13 + 3) + 1 = 13 × 16 + 1 = 1209

Hence, option (d).

» Your doubt will be displayed only after approval.

Doubts

Komal said (2022-12-21 22:24:26)

How to do this

Mani kaushik said (2022-12-21 10:22:16)

9:109::7:71::13:?

Reply from Admin:

Solution updated.

Kartik gaur said (2022-12-21 10:21:32)

9:109::7:71::13:?

Reply from Admin:

Solution updated.

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