Test Index

BECE Mathematics 2021 Paper

Question : 13

Total: 40

Solution:

Concept:

Probability of an event is the ratio of favourable outcomes to the total number of outcomes.

Explanation:

Total balls in the bag = red balls + black balls.

Total balls =

5 + 7 = 12

Favourable outcomes for picking a black ball = number of black balls =

7

So,

P(\text{black ball}) = \frac{\text{black balls}}{\text{total balls}} = \frac{7}{12}

This matches option C.

Answer:

\frac{7}{12}

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