This can be done in 10 ways: 975, 973, 972, 953, 952, 932, 753, 752, 732, 532

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Simplifying 34/99 +69/99 +80/99 -44/99 – 33/99 – 7 /99 we get 1 as answer.

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Probability of non-defective item=0.97*0.94=0.91 as both event are independent event.

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Probability of error = 0.015

Probability of no error = 1 – 0.015 = 0.985

For 70 components, the probability of no error = (0.985)70

Thus, the probability of rejection = 1 – (0.985)70

4 men can complete the work in 7 hours.

1 man will complete the work in (4*7) 28 hours.

28 hours are taken by 1 man to complete the work.

1 hour will be taken by 28 men to complete the work.

And to complete the same work in 2 hours, 14 men will be needed.

Alternatively,

Recall the formula: M1*T1 = M2*T2

4 * 7 = M2 * 2

M2 = 14 men.