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Sn=m , Sm=n find Sm+n . …

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Sn=m , Sm=n find Sm+n . Chapter 5 AP cbse

Posted by Harshit Trivedi 5 years ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years ago

Let a is the first term and d is the common difference .

(m - n) = -2a(m-n)/2 -(m-n)(m+n)/2+(m-n)d/2
1 = -2a/2 - (m+n)/2 + d/2
1 = -1/2 {2a + (m+n-1)d} ---------(1)

from equation (1)
S_{m+n} = -(m+n)

3Thank You

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