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Question

Sum 712,7,612, ..... to 24 terms.

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Solution

The given series is 712,7.5,612,... to 24 terms
a=712=7.5
and d=7(7.5)=0.5
Sn=2a+(n1)d
S24=(2×7.5)+[(241)×(0.5)]
=15+11.5
S24=3.5

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