Question

In the following question, select the missing number from the given series.
1, 3, 6, 10, 15, ?

A) 20 B) 21 C) 22 D) 24

Answer 1

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B) 21

because

1

1+2 = 3

3+3 = 6

6+4 = 10

10+5 = 15

then;

15+6= 21