If n term of A.P.be (2n-1) then sum of first n term will be what?
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Answer:
=n²
Step-by-step explanation:
Tn=2n-1
T1=1,T2=3
d=T2-T1=2
SUM OF n TERMS Sn=n/2(2a+(n-1)d)
=n/2(2+(n-1)2)
=n/2(2+2n-2)
=n/2*2n
=n²
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