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Question

Find out the greatest possible sum of the terms of AP : 20, 17, 14, 11............


A
66
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B
0
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C
63
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D
77
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E
37
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Solution

The correct option is D 77

Solution: Option (d)

Greatest possible sum happens when all the terms are positive.

tn>0

20+(n1)(3)>0

203n+3>0

23>3n

n<(233)

n has to be 7

Seventh term t7=20+6(3)=2

So, sum =(72)(20+2)=77


Quantitative Aptitude

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