From the numbered cards numbered from 2 to 30, a card is drawn at random. Find the probability of getting a card of square number or cube number.

Question

Stacy Fitzpatrick

Mathematics

14 March, 07:45

From the numbered cards numbered from 2 to 30, a card is drawn at random. Find the probability of getting a card of square number or cube number.

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Summer Case · Answer 1

Cards less than 14 : {2,3,4,5,6,7,8,9,10,11,12,13} 12 instances or P (N<14) = 12/100=3/25

Perfect squares : {4,9,16,25,36,49,64,81,100} 9 instances or P (perf. sq.) = 9/100

Prime number less than 20: {2,3,5,7,11,13,17,19} 8 instances or P (P<20) = 8/100=2/25