What per cent of numbers from 1 to 70 have squares that end in the dig – InterviewSolution

1.

What per cent of numbers from 1 to 70 have squares that end in the digit 1 ?

Answer»

The numbers from 1 to 70 that have their squares ending in digit 1 are :

1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69 i.e., 14 in numbers.

\(\therefore\) Required percentage = \(\frac{14}{70}\) x 100 = 20%

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