a box contains 80 discs which are numbered from 1 to 80. If one disc is drawn at random from the box find the probability that it bears a two digit number, a perfect square number, a number divisible by 5
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i) P(2 digit no.) =71/80
ii) P(perfect square)= 8/80=1/10
iii)P(divisible by 5)=16/80=1/5
sipanypragya:
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Answer:
Total number of discs in the box =80
Perfect squares from 1 to 80=1,4,9,16,25,36,49 and 64.
Possible outcomes =8
Probability is given by,
P(A)= No. of total outcomes/no. of possible outcomes
P ( getting a number which is a perfect square )= 8/80= 1/10
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