ABSTRACT
General expression for the n′th term of an AP If the 1st term of an AP is ‘a’ and the common difference is ‘d’ then
the n′th term is: a + (n − 1)d In example (i) above, the 7th term is given by 1+(7−1)3=19, which may be readily checked. Sum of n terms of an AP The sum S of an AP can be obtained by multiplying the average of all the terms by the number of terms.
