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Question

The sum of first 11 terms of the A.P 2, 6, 10, 14,... is .


Correct Answer
A
242
Your Answer
B
244
Your Answer
C
424
Your Answer
D
240

Solution

The correct option is A 242
The sum of n terms of an AP with first term a and common difference d is given by
Sn=n2(2a+(n1)d)

a=2,d=4,n=11 

Hence,
Sn=112(2(2)+(111)4)
Sn=112(4+40)
Sn=112×44
Sn=242

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