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How many numbers between -11 and 11 are multiple of 2 or 3

Correct Answer: 15

Explanation:

Number between 0 and 11 which are multiple of 2 or 3
= 11/2 + 11/3 - 11/6 = 5 + 3 - 1
= 7
Number between 0 and -11 which are multiple of 2 or 3
= 11/2 + 11/3 - 11/6 = 5 + 3 - 1
= 7
∴ Number be 15, including 0


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