The sum of the expression \(\frac 1 {\sqrt 1 + \sqrt 2} + \frac 1 {\s – McqOptions

MCQOPTIONS

1.	The sum of the expression \(\frac 1 {\sqrt 1 + \sqrt 2} + \frac 1 {\sqrt 2 + \sqrt 3} + \frac 1 {\sqrt 3 + \sqrt 4} + ... + \frac 1 {\sqrt {80} + \sqrt {81}}\) is
A.	7
B.	8
C.	9
D.	10
Answer» C. 9

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