Question

Q 57 tell right answer and how

Answer 1

Answer:

2

Step-by-step explanation:

1/(√1+√2)+1/(√2+√3)+1/(√3+√4).....1/(√8+√9)

By rationalising denominator,

=-√1-√2+√2-√3+√3-√4+√4.......-√8+√9

=√9-√1

=3-1

=2