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Number Series

Find out the missing number in the following sequence : 1, 3, 3, 6, 7, 9, ?, 12, 21.
(1) 10
(2) 11
(3) 12
(4) 13

Sol. Clearly, the given sequence is a combination of two series :
I. 1, 3, 7, ?, 21 and II. 3, 6, 9, 12
The pattern followed in I is + 2, + 4, ...; and the pattern followed in II is +3. Thus, missing number = 7 + 6 = 13.
Hence, the answer is (4).

Related MCQ Number Series

7, 11, 16, 23, 25, 35, - ?
1) 34
2) 36
3) 38
4) 42

2, 5, 7, 12, 15, 17, 22, -?
1) 25
2) 26
3) 27
4) 28

2, 5, 10, 17, -?
1) 34
2) 24
3) 20
4) 26

0, 7, 26, 63, 124, -?
1) 215
2) 195
3) 240
4) 208

In the series 357, 363, 369, ..., what will be the 10th term ?
(1) 405
(2) ...

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