Test Index

BECE Mathematics 2017 Paper

Question : 34

Total: 40

Solution:

Number of samples

=40

Number of sticks not spoilt = 40 -

15=25

Alternatively

Probability of not

=1-

Probability of is

=1

- Probability of not

Thus when you sum up probability and it's negative, the result should be 1

Now we can substract the probability of the spoilt from 1 to get the probability of not spoilt

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