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Find the wrong number in the given number series? 5, 8, 40, 90, 664

Correct Answer: 40

Explanation:

The given number series is 5, 8, 40, 90, 664


5


5 - 1 x 2 = 8


8 - 3 x 4 = 20 (NOT 40)


20 - 5 x 6 = 90


90 - 7 x 8 = 664


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