1. Print the Nth number of the series: 0,0,550,275,1100,550,1650,825,2200,1100,2750,1375,3300,1650,3850,1925,4400,2200,…. Input: N = 8 Output: 825 Input: N = 11 Output: 2750 2. Take a string as an input. Then find frequency of a particular character. Secondly, convert first characters of every word to corresponding uppercase letter. Finally, add a random special character at the end, for every input after that string. Enter a string: I Love competitive Coding. Input: o Output: Frequency of o = 3 Final string = I Love Competitive Coding $ Input: e Output: Frequency of e = 3 Final string = I Love Competitive Coding % 3. Program to replace certain characters in a string and then add a specific number on that string. Logic for added number: a =1, b=2, …., k=11…., y=25, z=26 So, hi == 89 because h: 8, i :9 Example: Input: hi Soham string to be replaced: hi string to be replaced with: hey (h=8, e=5, y=25) output: hey Soham 8525