Correct option is C
Given: 15, 21, 27, 33, 39, ?
Logic: Each number is increase by +6.
15 + 6 = 21,
21 + 6 = 27,
27 + 6 = 33,
33 + 6 = 39,
39 + 6 = 45.
So, missing number is 45.
Thus, the correct answer is (c).
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Question
What number should come in place of the question mark (?) in the following sequence?
15, 21, 27, 33, 39, ?
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