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The sum of two numbers is 18. The greatest product of these two number can be:

a) 17
b) 80
c) 81
d) Can’t determined

Answer: c
Explanation: a + b = 18
Maximum of (a × b) will be only when a = b
Thus, a = b = 9
Maximum of (a × b) = 9 × 9 = 81.

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