Probability Practice Test 2

Question : 4 of 37

Marks: +1, -0

Seven chits are numbered 1 to 7. Four are drawn one by one with replacements. The probability that the least number on any selected chits is 5 is

Solution:

P (5 or 6 or 7) in one draw =

3/7

∴ Probabilty that in each of 4 draws, the chits bear 5 or 6 or 7

= (3/7)^4

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