Question 140
In the following number series a wrong number is given. Find out that number.
8, 18, 40, 86, 178, 370, 752
Solution
In the series : 8, 18, 40, 86, 178, 370, 752
The pattern followed is that we multiply the first number by 2 and add 2 to it, for the second number, we multiply by 2 and add 4, for the third, multiply by 2 and 6 and so on...
8 x 2 + 2 = 18
18 x 2 + 4 = 40
40 x 2 + 6 = 86
86 x 2 + 8 = 180
180 x 2 + 10 = 370
370 x 2 + 12 = 752
So, the wrong number is 178.
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