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The first term of an A.P is 2 and last t...

The first term of an A.P is 2 and last term is 59. Find the common difference if sum of all terms is 610 .

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`a=2,l=T_(n)59,d=?S_(n)=610`
`S_(n)=(n)/(2).(a+l)rArr610=(n)/(2)(2+59)rArr610=(n)/(2).(61)rArrn=20`
`T_(n)=a+(n-1)drArr59=2+19drArr57=19drArrd=3`
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