Instructions

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

Question 113

188, 154, 140, 132, 128, 126, 125

Solution

Successive powers of 2 are subtracted.

188 $$- 2^5$$ = 156 $$\neq 154$$

156 $$- 2^4$$ = 140

140 $$- 2^3$$ = 132

132 $$- 2^2$$ = 128

128 $$- 2^1$$ = 126

126 $$- 2^0$$ = 125

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