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प्रश्न
How many positive three-digit integers have the hundredths digit 8 and unit’s digit 5? Find the probability of selecting one such number out of all three-digit numbers.
योग
उत्तर
Total number of three-digit numbers = 900
Numbers with the hundredth digit 8 and the unit’s digit 5 are 805, 815, 825, ..., 895.
Number of favourable outcomes = 10
P(selecting one such number) = `10/900 "or" 1/90`
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