value of n is what ??
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1-1/n+1=19/20. 【1/(1×2) can be written as 1/1-1/2】
(n+1-1)/n+1=19/20
n/n+1=19/20
20n=19n+19
n=19
(n+1-1)/n+1=19/20
n/n+1=19/20
20n=19n+19
n=19
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