Math, asked by dheerajpanyam, 15 hours ago

The first and last two terms of an A.P. are a,b,c respectively in order. Then the sum of all the term is​

Answers

Answered by bawejavidhya
0

Answer:

a,b,c...

common difference=d

a+d=b

a+2d=c

sum=a+b+c

=a+a+d+a+2d=3a+3d

a+c=a+a+2d=2a+2d

b+c-2a=a+d+a+2d-2a=2a+3d-2a=3d

2(b-a)=2(a+d-a)=2d

Step-by-step explanation:

thnku

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