Question 41823
Look, the difference between the prices of tickets of any two consecutive serial no. is 1.5.
So we can denote the price of the n-th ticket as ${{{1.5+1.5(n-1) = 1.5n}}}.


If the absolute value (means only value irrespective of sign + or -) of difference between any two consecutive terms is constant in a series, then the series is called Arithmetic Series or Arithmetic Progression (A.P). The general form of an A.P. series upto n-terms is: a, a+d, a+2d, a+3d, ...... , a+(n-1)d. The first term is 'a' and the above mentioned difference is called common difference and is equal to 'd'. The n-th term of the series is 'a+(n-1)d'.