3 years ago

How many 5 digit numbers have the property that all their digits are ascending.

1 answer:

6 0

Answer:

So, for the ascending order, there are only 9 digits to choose from, and hence, there are 9C5 ways to choose the 5 digits. So, there can be 9C5=126 5-digit no.s with their digits in an ascending order.

126 5

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0.0158 = 1.58% probability that all of them are under 18.

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If three events, A, B and C are independent, the probability of all happening is the multiplication of the probabilities of each happening, that is:

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