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What will come at the place of question mark ? 6, 11, 21, 36, 56, ?

What will come at the place of question mark ? 6, 11, 21, 36, 56, ?

Explanation

Explanation

6 (+5)→ 11

11 (+10)→ 21

21 (+15)→ 36

36 (+20)→ 56

56 (+25) → 81.