Question

A basket has 1465 apples . what will be the number of apples in 57 such baskets ?​

Answer 1

Favorable outcomes:  -->  choosing one rotten out of 1 and  choosing any for the second apple;

Total # of outcomes: , choosing 2 apples out of 5;

.

Reverse combinatorial approach:

Let's count the probability of the opposite event and subtract this value from 1. The opposit event will be if out of 2 apples both are good, so .

Direct probability approach:

: probability of {first apple rotten, second apple good} plus the probability of {first apple good, second apple rotten}.

Reverse probability approach:

Again 1- the probability of the opposite event --> .

Answer 2

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