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

Find thewrong number in the given number series? 5, 8, 40, 90, 664 Correct Answer 40

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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