The triangular numbers are as follows: 136101521etc.=1==1+2=1+2+3=1+2+3+4=1+2+3+4+5 The series begins with 1 (the first triangular number). To calculate the nth triangular number, n is added to the previous triangular number. For example, the fourth triangular number is calculated by adding 4 to the third triangular number (which is 6 ), i.e. 10=(1+2+3)+4. Write a recursive function in that will calculate the nth triangular number. Note: will not receive any credit for a non-recursive solution. For example, the following statements would lead to the underlined output: Example 1: print(triNum(1));1 Example 2: print(triNum(2));3 Example 3: print(triNum(5));15