Evaluate :

`1 + 1/ ( 1 + 1/ ( 1 + 1/3 )` is equal to :

1 div 1/(1 div 1/(1 div 1/3)) is equal to :

Evaluate : ( a + 1 ) ( a - 1 ) ( a^2 + 1 ) is equal to

Evaluate : 1/2 + 1/3 + 1/4

Evaluate : { ( x^n )^(n-1 ) }^(1/( n(n-1 )) is equal to

3(1)/(5)+1(2)/(3) is equal to

Evaluate : ( 1/2 - 1/3 ) + ( 1/3 - 1/4 ) + ( 1/4 + 1/2 ) is equal to ( a ) 0 ( b ) 1/4 ( c ) 1/2   ( d ) 1

Evaluate : ( 2^(-1 ) + 3^(-1 ) + 5^(-1 ) )^( 0 ) is equal to

Evaluate : ( 1 + 1/2 ) times ( 1 + 1/3 ) times ( 1 + 1/4 ) times ( 1 + 1/5 ) times ( 1 + 1/6 ) times ( 1 + 1/7) times ( 1 + 1/8 ) is equal to

Evaluate : (1 - 1/3 )^2 times ( 1 - 1/4 )^2 times ( 1 - 1/5 )^2 ------- ( 1 - 1/n )^2 is equal to :

Evaluate : ( 1 - 1/2 ) times ( 1 - 1/3 ) times ( 1 - 1/4 ) times ( 1 - 1/5 ) =