The Total solution for NCERT class 6-12
The first term of anA.P. (a) = 5and common difference (d) = 3Last term = 80Let the last term be nthan = a + (n – 1) d=> 80 = 5 + (n – 1) x 3=> 80= 5 + 3n – 3=> 3n = 80 – 5 + 3 = 78=> n = 26Number of terms = 26