CTET PAPER I 2018 · PYQ · Series / Patterns · easy
The sum of 1 −1 1 −1 1 −1… to even number of terms is—
A.zero✓ Correct
B.−1
C.1
D.2
Explanation
Pairing consecutive terms (1−1) + (1−1) + (1−1)+ … each pair sums to 0. With an even number of terms, all terms pair up exactly, giving a total sum of 0.
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