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Asked by Jake

Let a1,a2,a3..... be an increasing arithmetic sequence of integers. If a4a5=13 what is a3a6?
10 years ago

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Answered by Steve
If a4a5 means a4*a5, then clearly a4=1 and a5=13, making d=12.

So, a3a6 = (-11)(25) = -275
10 years ago

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