Decompose the terms in the sum as
so there are 20 terms in the sum. Then our sum simplifies to
Now, if
we can reverse the order of terms to get the same sum,
so that doubling up the sum gives
So, our sum evaluates to
Help please!! Which are factor pairs of 3580? (Hint: Look at the first factor in each pair and use divisibility rules.) Select a
1 answer:
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