Question

Class 9
Pearson Math Ch -1

Question 56. Level 3

Solve This

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Answer 1

Rationalize

√k - √k+1)/ √k+ √k+1)( √k -√k+1)

√k -√k+1)/ k - ( k+1)

√k+1 - √k

Now sigma k= 4 to 143

√5 -√4

√6 -√5

√7-√6

...

...

√144 -√143

Cancelling all diagonals

its only -√4 +√144 left

-2 + 12

10

So a= 10, b= 0

So option A

Answer 2

Step-by-step explanation:

hii my self Priyanshu kumar

class 9 from St Mary's school