" 4.If "a=6,quad d=3" then find "S_(2.5)" ? "

In an A.P, a=6 and d=3 . Then find S_27 .

If for an A.P. (i) a=6, d=3, find S_(10) (ii) a=6, d=3 , find S_(6)

If for an A.P. (i) a=6, d=3, find S_(10) (ii) a=6, d=3 , find S_(6)

In an AP: (i) given a=5, d=3, a_(n)=50 , find n and S_(n) . (ii) given a=7, a_(13)=35, find d and S_(13) (iii) given a_(12)=37, d=3 , find a and S_(12) (iv) given a_(3)=15, S_(10)=125 , find and a_(10) . (v) given d=5, S_(9)=75 and a and a_(9) . (vi) given a=2, d=8, S_(n)=90 , find n and a_(n) . (vii) given a=8, a_(n)=62, S_(n)=210 . find n and d. (viii) given a_(n)=4, d=2, S_(n) = -14, find n and a. (ix) given a_(n)=3, n=8, S_(n)=192, find d. (x) Given l=28, s=144 and there are total 9 terms find a.

If S_(5) = 15 and S_(6) = 21, "find "t_(6) .

If in an A.P., S_(2n)=3.S_(n) then S_(3n) : S _(n) = (a)5 (b) 6 (c)7 (d)8

If A=[(1,2),(3,4),(5,6)] and B=[(-3,-2),(1,-5),(4,3)] , then find D=[(p,q),(r,s),(t,u)] such that A+B-D=O .

If A=[(1,2),(3,4),(5,6)] and B = [(-3,-2),(1,-5),(4,3)] , then find D = [(p,q),(r,s),(t,u)] such that A + B - D = 0.

If A=[(1,2),(3,4),(5,6)] and B=[(-3,-2),(1,-5),(4,3)] , then find D=[(p,q),(r,s),(t,u)] such that A+B-D=O .