Rationalise the denominator of each of the following.(i) 1/(sqrt(7) + sqrt(6) - sqrt(13))(ii) 3/(sqr

Rationalise the denominator of each of the following. (i) 1/(sqrt(7) + sqrt(6) - sqrt(13)) [2011] (ii) 3/(sqrt(3) + sqrt(5) - sqrt(2)) (iii) 4/(2 + sqrt(3) + sqrt(7))