" iv) "^(13)C_(6)+^(13)C_(5)

Evaluate (i) ""^(10)C_(4)+""^(10)C_(5) (ii) ""^(13)C_(6)+ ""^(13)C_(5) (iii) ""^(19)C_(17)+ ""^(19)C_(18) .

If ""^(13)C_(X) = ""^(13)C_(Y) and X ne Y , then the value of X+Y is

If ""^(13)C_(X) = ""^(13)C_(Y) and X ne Y , then the value of X+Y is

The value of .^(13)C_(7)+.^(13)C_(8)+.^(13)C_(9)+.^(13)C_(10)+.^(13)C_(11)+.^(13)C_(12)+.^(13)C_(13) is equal to

The value of .^(13)C_(7)+.^(13)C_(8)+.^(13)C_(9)+.^(13)C_(10)+.^(13)C_(11)+.^(13)C_(12)+.^(13)C_(13) is equal to

If .^(13)C_(r)=^(13)C_(r+5) , find r.

._(6)^(14)C,._(6)^(13)C, ._(6)^(12)C what are these?