The value of `root4((81)^(-2))` is (A)1/9 (B)1/3 (C)9 (D)1/81

The value of [{(81)^(-1/2)}^(-1/4)]^2

The value of ((32)/(243))^(-4/5) is a.(4)/(9) b.(9)/(4) c.(16)/(81) d.(81)/(16)

The value of ((9^(2)xx18^(4))/(3^(16))) is a.(3)/(2) b.(4)/(9) c.(16)/(81) d.(32)/(243)

If 2a+b+3c=1 and a>0,b>0,c>0 then the greatest value of a^(4)b^(2)c^(2) is (1)/(9.4^(8)) b.(1)/(9.4^(5)) c.(1)/(9^(4).4^(8)) d.(1)/(9^(4).4)

The value of: (9^(x)(9^(x-1)))^(x)/(9^(x+1).3^(2x-2)){(729^(x/3))/81}^(-x) + (3^(a) -2^(3) .3^(a-2))/(3^(a) -3^(a-1)) is:

{(root3((81)^2))^(3//2)}^(1//4 )=?

(81a^(2)-4)-:(9a+2)

the value of (1)/((81)^n)-^(2n) C_1. ((10)^2)/((81)^n)+ ^(2n) C_1 ((10)^2)/((81)^n)…....+((10)^2n)/((81)^n) is