30*(1-(1)/(3))(1-(1)/(4))(1-(1)/(5))...(1-(1)/(n))=?

(-(1)/(3))(1-(1)/(4))(1-(1)/(5))......*(1-(1)/(n))=x

Which of the following is equal to (1-(1)/(3))(1-(1)/(4))(1-(1)/(5))dots(1-(1)/(n))?

What is the value of the following? (1-(1)/(2))(1-(1)/(3))(1-(1)/(4))dots(1-(1)/(n-1))(1-(1)/(n))

(1-(1)/(3))(1-(1)/(4))(1-(1)/(5))(1-(1)/(6))dots(1-(1)/(n))

When simplified the product (1 - (1)/(3)) (1 - (1)/(4)) (1- (1)/(5)) …. (1 - (1)/(n)) becomes :

The expression (1+(1)/(3))(1+(1)/(4))(1+(1)/(5))1+(1)/(n) simplifies to (n+1)/(3) (b) (n)/(n+1) (c) (3)/(n) (d) 1+(1)/(31)/(41)/(5)(1)/(n)

For n in N ,if tan^(-1)((1)/(3))+tan^(-1)((1)/(4))+tan^(-1)((1)/(5))+tan^(-1)((1)/(n))=(pi)/(4) ,then (n-2)/(15) is equal to

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

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