What percentage of numbers from 1 to 70 have | vedclass

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(C) number's square ends in $1$ if the number itself ends in $1$ or $9$ (since $1^2 = 1$ and $9^2 = 81$).In the range $1$ to $70$,the numbers ending i

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$20$

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(C) number's square ends in $1$ if the number itself ends in $1$ or $9$ (since $1^2 = 1$ and $9^2 = 81$).In the range $1$ to $70$,the numbers ending in $1$ are: $1, 11, 21, 31, 41, 51, 61$ (Total $7$ numbers).The numbers ending in $9$ are: $9, 19, 29, 39, 49, 59, 69$ (Total $7$ numbers).Total count of such numbers $= 7 + 7 = 14$.The total number of integers from $1$ to $70$ is $70$.Required percentage $= (14 / 70) 	imes 100 = 0.2 	imes 100 = 20 \%$.

What percentage of numbers from $1$ to $70$ have squares that end in the digit $1$?

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