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Question

Find the sum of the first 15 terms of the sequence having nth term as
yn=9−5n

A
390
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B
468
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C
465
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D
468
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Solution

The correct option is C 465
yn=95n

y1=95=4

y2=910=1

d=y2y1=14=5

Thus, S15=152[2(4)+14(5)]

=152[870]=465

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