How many different ordered pairs (x, y) are there such that x is an even integer, where $4 \leq x \leq 10$ and y is an integer, where 4 < y < 10 ?

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Solution

The correct option is C 20
Given that ordered pairs $(x, y)$ are such that $x$ is even integer where $4 \leq x \leq 10$ and $y$ is an integer. where $4 < y < 10$ .
Then even integer $4 \leq x \leq 10$ are four i:e $4, 6, 8, 10$
And integer $4 < y < 10$ are five i:e $5, 6, 7, 8, 9$
Then ordered pair are $=$ $4 \times 5 = 20$

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