find the s for gp 1+1/2+1/2×2
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Answer:
Given series is −1,1,−1,1,....
Here a=−1,r=−1
We know the formula, S
n
=
1−r
a
1
(1−r
n
)
S
20
=
1−(−1)
1(1−(−1)
20
)
=
2
1(1−(−1)
20
)
=0
Step-by-step explanation:
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