Question

Find out the missing number in the
following sequence
1, 3, 3, 6, 7, 9, ?, 12, 21
a) 10 b)11 c)12 d)13
plz write full solution ​

Answer 1

Answer:

Clearly, the given sequence is a combination of two series :

I, 3, 7, ?, 21 and

II. 3, 6, 9, 12

The pattern followed in I is + 2, + 4, + 6, ..and the pattern followed in II is + 3.

So, missing number = 7+ 6 = 13.

Hence, the answer is (D)

Answer 2

Answer

Find out the missing number in the

following sequence

1, 3, 3, 6, 7, 9,11, 12, 21

a) 10 b)11 c)12 d)13