Question

18, 24, 21, 27, ?, 30, 27
(a) 33
(b) 30
(c) 24
(d) 21

Answer 1

18,21,?(24),27,

24,27,30

Answer 2

Answer:

(c) 24

Step-by-step explanation:

Given sequence,

18, 24, 21, 27, ?, 30, 27

By analysing the sequence,

We observe that,

24 - 18 = 6

21 - 24 = -3,

27 - 21 = 6,

Thus, by following this pattern,

If x be the unknown number,

Then x - 27 = - 3

x = - 3 + 27 = 24

∵ 30 - 24 = 6

And, 27 - 30 = - 3

Hence, the missing number would be 24,

OPTION (c) is correct.