Instructions

In each of the following number series, a wrong number is given. FInd out the wrong number.

Question 139

50 51 47 56 42 65 29

Solution

$$50+1^2 = 51$$
$$51-2^2 = 47$$
$$47+3^2 = 56$$
$$56-4^2 = 40$$
$$40+5^2 = 65$$
$$65-6^2 = 29$$

42 is the incorrect number

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