If nth term of an A.P. is (2n+1),what is the sum of its first third nu

1.	If nth term of an A.P. is (2n+1),what is the sum of its first third number
Answer» If nth term of an A.P = 2n+1then, first term of A.P = 2(1)+1= 2+1= 3then, second term = 2 (2) + 1》4+1》5third term = 2 (3) +1》6+1》7sum of terms = 3+5+7sum of terms = 15

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