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Show that the sum of an A.P. whose first...

Show that the sum of an A.P. whose first term is a, the second term is b and the last term is c, is equal to `((a+c)(b+c−2a))/(2(b−a))

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The correct Answer is:
`S_n = ((a+c)(b+c-2a))/(2(b-a)).`
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