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Order of a Differential Equation

3, 7, 15, ?, ...

Question

3, 7, 15, ?, 63, 127

A

30

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B

31

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C

47

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D

52

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Solution

The correct option is D 31
Each number in the series is one more than twice the preceding number.
So, missing term = (15 x 2) + 1 = 31.

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