The sum of first n terms …
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Preeti Dabral 1 year, 9 months ago
To find the AP if the sum of first n terms of arithmetic progression is 210 and sum of its first (n-1) terms is 171. If the first term is 3 .
As we know that if AP has n terms,then after removing (n-1) terms,we are left with the last term.
ACF, last term is 210-171
l= 39
a= 3
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