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If p y 2y geq 6 and Q y y -3 geq 4 where y is a... - WAEC Mathematics 2013 Question

If p = (y : 2y (\geq) 6) and Q = (y : y -3 (\geq) 4), where y is an integer, find p(\cap)Q

A
{3, 4}
B
{3, 7}
C
{3, 4, 5, 6, 7}
D
{4, 5, 6}
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Correct Option: C

p = (y : 2y (\geq) 6)

2y (\leq) 6

y (\leq \frac{6}{2})

y = (\leq) 3

and Q = (y : y -3 (\geq) 4)

y - 3 (\geq) 4

y (\geq) 4 + 3

y (\geq) 7

therefore p = {3, 4, 5, 6, 7} and Q = {7, 6, 5, 4, 3....}

P(\cap)Q = {3, 4, 5, 6, 7}

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