What percentage of the numbers from 1 to 50 have squares that end in the digit 1 ?
A. 1%
B. 5%
C. 10%
D. 11%
E. 20%
Answer: Option E
Solution(By Examveda Team)
The squares of numbers having 1 and 9 as the unit's digit end in the digit 1.$$\eqalign{ & {\text{Such numbers are,}} \cr & 1,9,11,19,21,29,31,39,41,49{\text{ i}}{\text{.e}}{\text{.,}} \cr & {\text{There are 10 such numbers}}{\text{.}} \cr & \therefore {\text{Required percentage}} \cr & = \left( {\frac{{10}}{{50}} \times 100} \right)\% \cr & = 20\% \cr} $$
Related Questions on Square Root and Cube Root
The least perfect square, which is divisible by each of 21, 36 and 66 is:
A. 213444
B. 214344
C. 214434
D. 231444
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