Question

किसी समांतर श्रेणी का पहला पद A तथा अंतिम पद L हो तो सिद्ध करो आरंभ से r वे पद और अंत से r वे पद का योग
(A+L) होगा ?

If the first term of a parallel category is a and the last post l, prove that the beginning of r from the beginning and end of r will be (a + l) ?

Answer 1

!! Hey Mate !!

your answer is ---

Given, first term of given term is A and last term is L

Now, r term from beginning is

Tr = A + (r-1) d ......(1)


also, r term from last is

r term from last = L - (r-1)d ......(2)

adding equation (1) & (2), we get

Tr + r term from last = A + (r-1)d + L -(r-1)d

= (A+L)


Hence proved



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