Manipal Entrance Test 2014 Math Paper

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Question : 25 of 80

Marks: +1, -0

If

Δr=|

1	n	n
2r	n2+n+1	n2+n
2r−1	n2	n2+n+1

|

and

n

∑

r=1

Δr=56, then n is equal to

4
6
7
8

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