Probability Practice Test 1

Question : 39 of 40

Marks: +1, -0

In a box containing 100 bulbs, 10 are defective. The probability that out of a sample of 5 bulbs none is defective is

Solution:

Favourable ways of selecting 5 non-defective bulbs

= ^90C_5

.
Total no. of ways of selection

= ^100C_5

∴ P (non-defective bulbs)

={^90C_5}/{^100C_5}

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