You are given several problems and you are given a hint. Okay, what have you done on these? Have you written down Pascal's triangle and looked at it?
Find the formula/ equation of these sequences: Clue:Pascal's Triangle
1) 1,6,28,120
2) 1,5,21,84,330
3) 1,4,15,56,210,792
4) 1,3,10,35,126,462,1716
x must start from 0,1,2,3, and so on....