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If the ratio of sum of the first n terms of two AP's is (7n-1):(4n+27).Find ratio of their m th terms

Posted by Ankita Kalal 4 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Hemang Dubey 4 years, 7 months ago

Sn1/Sn2 = 7n-1/4n+27 Make the equations , a+(n-1/2)d/a2+(n-1)=7n-1/4n+27 Now, am1/am2=a1+(m-1)d/a2+(m-1)d2 Now compare n-1/2=m-1 You will get n=2m-1 Just put the values you will get the answer .

1Thank You

Hemang Dubey 4 years, 7 months ago

Answer is (14m-6):(8m+23)

1Thank You

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CBSE > Class 10 > Mathematics