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2016-01-10T20:01:25+05:30
Middle term of the ap will be 26..
n=26, an= a+(n-1)d= a26=a+25d=300
S51=51/2[2a+50d] = 51/2[2(a+25d) =51/2[2*300] = 51*300 = 15300
2 5 2