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Quantitative Aptitude

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The sum of th...

Question

The sum of the third and the ninth term of an AP is 10. Find a possible sum of the first 11 terms of this AP?

A

55

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B

44

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C

66

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D

None of these

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Solution

The correct option is A 55
T₃ + T₉ = 10

a+2d + a+ 8d = 10

2a+10d=10--------- (1)

Sum to 11 terms = 11/2 (2a+10d)

From 1, sum to 11 terms =11/2 (10) = 55

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