the sum of 1+2/5+3/5^2+4/5^3....upto n term
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Sn=n/2{2a +(n-1) d}
=n/2{2*1+(n-1) - 3/5}
=n/2(2-3/5n+3/5}
=n/2(13/5-3/5n)
=
avinashmarshal:
sry wrong option
where is Option
its 25/16
ring anser
wrong answer
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