The number 3360 can be expressed as the product of 3 consecutive whole numbers. What is the sum of these 3 numbers?
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It might be a bit hard to notice, but 3 3 6 0 = 1 5 3 − 1 5 . Now, we go to the form x 3 − x Which upon factorisation, becomes ( x ) ( x + 1 ) ( x − 1 ) . These happen to be consecutive numbers, thus we only need to find the sum of 15-1, 15 and 15+1. This leads to the answer of 4 5 .