Instructions

In the following number series, only one number is ‘‘wrong’’. Find out the ‘’wrong’’ number.

Question 135

828, 424, 220, 116, 64, 33

Solution

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424 = 828/2 + 10

220 = 424/2 + 8

116 = 220/2 + 6

The next number should be 116/2 + 4 = 62

So, 64 is the wrong number in the series.

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