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प्रश्न
There are 80 cards numbered from 1 to 80. One card is drawn at random from them. Find the probability that the number on the selected card is not divisible by 8.
योग
उत्तर
Total number of possible outcomes = 80.
Numbers divisible by 8 are 8, 16, 24, 32, 40, 48, 56, 64, 72, and 80.
There are total 10 numbers which are divisible by 8. Number of numbers (not divisible by 8)
= 80 −10 = 70
Number of favourable outcomes = 70
Required probability is
P(E) = `("Number of favourable outcomes")/("otal number of possible outcomes")`
= `70/80`
= `7/8`
Therefore, the probability that the number on the selected card is not divisible by 8 is `7/8`.
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