SSC CPO SI and ASI Model Paper 3

Question : 121 of 200

Marks: +1, -0

What will be the value of

1- 1 /2+ 1 /6+1 /12+ 1 /20+1 /30+ 1/42+ 1/56+ ?

Solution:

(3)

1- 1/2+ 1/6+ 1/12+ 1 /20+1/ 30+1/42+1/56

1 -1 /2+1 /2-1 /3-1/4 .......+1/ 7-1/8

=1-1/8=7/8

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