Suppose r and s are positive integers with no common factor and1 - 1/2 + 1/3 - 1/4 + ... + 1/1339 - 1/1340 = r/s
Find a prime factor of r.
Have no idea how to solve this so please help.
Please explain it step by step clearly. Thanks.
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You understand that this NOT a "geometric series", don't you?
No, what is it then?
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