" (vii) "(ab+1.1)(ab-1.1)

ab^(2)+(a-1)b-1

Multiply : (ab - 1)(3-2ab)

If |a|<1and|b|<1, then the sum of the series 1+(1+a)b+(1+a+a^(2))b^(2)+(1+a+a^(2)+a^(3))b^(3)+ is (1)/((1-a)(1-b)) b.(1)/((1-a)(1-ab)) c.(1)/((1-b)(1-ab)) d.(1)/((1-a)(1-b)(1-ab))

The simplified value of {(1-(1+2sqrt(ab))/(1-3sqrt(ab)))(sqrt(ab)(1-3sqrt(ab))-((1-ab)(4sqrt(ab)-1)/(1+sqrt(ab))}^(3)+8ab

(1)/(log_(a)(ab))+(1)/(log_(b)(ab))=1

If A, B are two n xx n non-singular matrices, then (1) AB is non-singular (2) AB is singular (3) (AB)^(-1)=A^(-1) B^(-1) (4) (AB)^(-1) does not exist

If x=sqrt(a(ab sqrt(a(ab...)^(1/3)))^(1/3)) then x=