Instructions

In each of the following questions, find out the wrong number in the series.

Question 17

27, 81, 1331, 125

Solution

here we need to find the odd one out in 27, 81, 1331, 125

as we know

27 = 3^3

81 = 3^4

1331 = 11^3

125 = 5^3

here we can clearly see that 81 is the only number which is not a perfect cube and hence 81 is the odd one out

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