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infinite terms

1-1+1-1+1-1........1= 1/2

by sum of infinite terms a/1-r = 1/[1-(-1)] = 1/2

But 'r' should be -1<r<1. Then how here 'r' can be '-1'??

Please somebody explain this....

Note by Dhara Jogi
2 years, 12 months ago

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