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JAMB Mathematics 2018 Paper

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Question : 61

Total: 62

If X, Y can take values from the set (1, 2, 3 ,4), find the probability that the product of X and Y is not greater than 6

$\frac{5}{8}$
$\frac{5}{16}$
$\frac{1}{2}$
$\frac{3}{8}$

Solution:

x	1	2	3	4
1	1*	2*	3*	4*
2	2*	4*	6*	8
3	3*	6*	9	12
4	4*	8	12	16

The numbers that are not greater than 6 are either less than 6 or equal to 6.

P(picking a number not greater than 6) = $\frac{10}{16}$

= $\frac{5}{8}$

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