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If a1,a2,a3,...........is an A.P Such that …

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If a1,a2,a3,...........is an A.P Such that a1+a5+a10+a15+a20+a24=225 a1+a2+a3+......+a23+a24 is equal to ???

Posted by Muhammed Shahabas 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Khushboo Giri 6 years, 10 months ago

Yes, a+ a5+a10+a15+a20+a24 =225 a+ a+4d + a+4d+ a+4d + a+4d + a+4d =225 6a+ 69d=225 3(2a+23d)=225 2a+23d=75-------(1) Now, S24= 24/2{2a+(24-1)d} =12(2a+23d) =12×75. (from 1) =900

1Thank You

Puja Sahoo? 5 years, 8 months ago

Kya answer 900 hai

2Thank You

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CBSE > Class 10 > Mathematics