For each positive integer n, the nth term of the sequence S is 1+

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For each positive integer n, the nth term of the sequence S is 1+$$(-1)^n$$.

Quantity A:The sum of the first 39 terms of S

Quantity B:39

A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案：B

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