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In the following question, select the missing number from the given series.
1, 3, 6, 10, 15, ?
Consecutive natural numbers are added.
1 + 2 = 3
3 + 3 = 6
6 + 4 = 10
10 + 5 = 15
15 + 6 = 21
=> Ans - (B)
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