Mathematics, 23.03.2021 19:10, EvankzGao

A box contains 40 pens. 30 of the pens are blue and the rest are green. one pen is taken out at random and replaced by five of the other colour. another pen is taken out at random. A. work out the probability that are 3 pens are green.
B. work out the probability that all three pens are the same colour.
C. work out the probability that all three pens on not the same colour. Help please

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A box contains 40 pens. 30 of the pens are blue and the rest are green. one pen is taken out at rand...