SSC CPO SI and ASI Model Paper 6

Question : 129 of 200

Marks: +1, -0

What will be the value of

1/7-1/14+1/42+1/84+1/140+1/210+1/294+1/49?

Solution:

1/7- 1/ 14+1 /84+1/140+ 1/210+1/294+1/ 49

=1 /7 [1-1/ 2+1/ 6+1 /12 +1 / 20+1/ 30+ 1 / 42+1/7]

=1/7[ 1- 1/2+ 1/2- 1/3- 1/4+ 1/4- 1/5+ 1/5- 1 /6+1/6+1/7+ 1/7]

=1/7

Go to Question:

Prev Question

Next Question