In an AP `a_(n) = (5n-3)/(4)`, then `a_(7)` = ………..

In an AP if d=4,n=7,a_(n)=4 then a is

a_(n) = 9-5n, a_(4) = ………….

If lt a_(n) gt is an A.P. and a_(1) + a_(4) + a_(7) + "………." + a_(16)= 147 , then a_(1) + a_(6) + a_(11) + a_(16) equals :

In an AP, if d = -4, n = 7 and a_(n) = 4, then a is equal to

In an AP, if d = -4, n = 7 and a_(n) = 4, then a is equal to

If in an A.P (a_(7))/(a_(10))=(5)/(7) ,find (a_(4))/(a_(7))

Find the indicated terms in each of the following sequences whose nth terms are: a_(n)=5_(n)-4;a_(12) and a_(15)a_(n)=(3n-2)/(4n+5);a+7 and a_(8)a_(n)=n(n-1);a_(5)anda_(8)a_(n)=(n-1)(2-n)3+n);a_(1),a_(2),a_(3)a_(n)=(-1)^(n)n;a_(3),a_(5),a_(8)

If a_(1) , a_(2), a_(3) , cdots ,a_(n) are in A.P. with a_(1) =3, a_(n) =39 and a_(1) +a_(2) + cdots +a_(n) =210 then the value of n is equal to

If a_(n+1)=a_(n-1)+2a_(n) for n=2,3,4, . . . and a_(1)=1 and a_(2)=1 , then a_(5) =

Let a_(n) be the nth term of an A.P. and a_(3) + a_(5) + a_(8) + a_(14) + a_(17) + a_(19) = 198 . Find the sum of first 21 terms of the A.P.