NIFT UG 2018 Question Paper with solutions

Question : 3 of 150

Marks: +1, -0

The sum of first 50 odd natural number is

Solution:

To find

S=1+3+5+...

to 50 term, this forms an AP.

∴a=1;d=3-1=2

n=50

Sum of n terms of AP is given by
Sum of n terms of Ap is given by

S=n/2[2a+(n-1)×d]

=50/2[2×1-(50-1)×2]

=25(2+98)

=25×100=2500

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