The number of pairs \((x, y)\) of integers satisfying the inequality \(|x - 5| + |y - 5| \leq 6\) is:
Question and options
The number of pairs of integers satisfying the inequality is:
- 85
- 84
- 61
- 169
Answer and explanation
Correct answer: A - 85
There are 85 integer pairs. Translating the centre to , there is one pair at distance zero under the sum of absolute differences and pairs at each integer distance . The total is , and omitting the centre gives 84.
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