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In the AP if the 12th …

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In the AP if the 12th term is - 13 and the sum of its first four terms is 24 find sum of first 10 term

Posted by Shweta Raghu 5 years ago

CBSE > Class 10 > Mathematics

3 answers

Aastha .? 5 years ago

a+11d=-13 ..............(i)., and 4a+6d=24.........(ii),............using elimination method.... We get, d= -2 and a=9 ......................... . .... put these value in Sn= n/2(2a+(n-1)d.................... S10= 5(2×9 + 9×(-2)).=5×0..................................... So,, S10=0

Vimla Devi 5 years ago

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Aastha .? 5 years ago

Correct ans is 0...

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