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
(i) a two-digit number
(ii) a perfect square number.
(iii) a number divisible by 5.
at random from the box, find the probability that it bears
(i) a two-digit number
(ii) a perfect square number.
(iii) a number divisible by 5.
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Answer:
(i) there are 81 two digit numbers between 1and90.
(ii)square numbers are:2*2=4,3*3=9,4*4=16,5*5=25,6*6=36,7*7=49,8*8=64,9*9=81.
(iii)the numbers divisible by 5 from 1to 90 are 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90