title: How to find number of way that a postage of n cents can be made by 4, 6, 10 cents?
body: <p>For example,</p>
  
  <p>n = 4 (4x1) 1 way</p>
  
  <p>n = 10 (4x1, 6x1) (10x1) 2 ways</p>
  
  <p>Is there any equation can express the number of way?</p>