Question

A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box , find the probability that it bears .
A perfect square number.

Answer 1

Total number of discs$=90$

Perfect square number is a number like $1,4,9,16,25,36,49,64,81$

So,Total number of discs with perfect square number$=9$

$P\left(gettingaperfectsquarenumber\right)=\frac{Totalnumberofdiscwithperfectsquarenumber}{totalnumberofdiscs}$

$=\frac{9}{90}=\frac{1}{10}$