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Tn=4n-5 find sum of first 25 …

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Tn=4n-5 find sum of first 25 terms of ap

Posted by Sandeep Yadav 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Akash Kundu 7 years, 6 months ago

T1=4*1-5=-1 T25=4*25-5=95 S25=n/2(t1+t25) S25=25/2{(-1)+95} S25=1175 Ans=1175

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CBSE > Class 10 > Mathematics

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If 1/2 is a root of equation x^2+kx- 5/4 =0 , then what is the value of k

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CBSE > Class 10 > Mathematics

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CBSE > Class 10 > Mathematics