sum the series to n term :1+4+13+40+121........
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a=1
d= 4-1 = 3
sn=n/2[2a+(n-1) d]
=n/2[2*1+(n-1) 3]
=n/2[2+3n-3]
=n/2[3n-1] is the ans
hope it helps you
d= 4-1 = 3
sn=n/2[2a+(n-1) d]
=n/2[2*1+(n-1) 3]
=n/2[2+3n-3]
=n/2[3n-1] is the ans
hope it helps you
svmkr:
wrong answer this special series not the a.p series
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