" 15."(1)/(sqrt(9)-sqrt(8))" is equal to "

Evaluate : (1)/((sqrt(9)-sqrt(8))) is equal to

sqrt(10).sqrt(15) is equal to

sqrt(10).sqrt(15) is equal to

sqrt(6) xx sqrt(8) is equal to

1/(sqrt9-sqrt8) is equal to

(1)/(sqrt(9)-sqrt(8)) is equal to: 3+2sqrt(2)(b)(1)/(3+2sqrt(2)) (c) 3-2sqrt(2)(d)(3)/(2)-sqrt(2)

The value of (1)/(sqrt(10) - sqrt(9)) - (1)/(sqrt(11)-sqrt(10)) + (1)/(sqrt(12) - sqrt(11))………. - (1)/(sqrt(121) - sqrt(120)) is equal to