Question

What should come in place of the question mark (?) in the following number series?

30, 39, 66, ? , 174, 255

A 99 Correct Answer Incorrect Answer
B 100 Correct Answer Incorrect Answer
C 101 Correct Answer Incorrect Answer
D 111 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

30 + 9 × 1 = 39 39 + 9 × 3 = 66 66 + 9 × 5 = 111 111 + 9 × 7 = 174 174 + 9 × 9 = 255

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