An AP consists of 43 terms. If the sum of 5 middle most terms is 195 then what is the sum of the AP?
Dear student, ACQ, sum of 21st,22nd and 23rd term is 195 , i.e a+20d + a+21d + a+22d = 195 ,that implies a + 21d = 65 sum of the AP = n(2a + (n-1)d)/2 = 43( 2a + 42d)/2 = 43(a+21d) = 43(65) = 2795. Regards