The mth term of an arithmetic progressio...

The mth term of an arithmetic progression is x and nth term is y.Then the sum of the first (m+n) terms is: a. `(m+n)/2[x-y+[x+y]/[m+n]]` b. `1/2[[x+y]/[m+n]+[x-y]/[m-n]]` c. `1/2[[x+y]/[m+n]-[x-y]/[m-n]]` d. `(m+n)/2[x+y+[x-y]/[m-n]]`

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