1.

Let a_1, a_2, a_3,,a_(100)be an arithmetic progression with a_1=3a n ds_p=sum_(i=1)^p a_i ,1lt=plt=100.For any integer nwith 1lt=nlt=20 ,letm=5ndotIf (S_m)/(S_n)does not depend on n ,then a_2is__________.

Answer»

10
9
5
-1

Answer :B


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