சேந்தமங்கலத்து சிறகுகள்...
Part 1: 1 white trianglePart 2: 2+1 = 3 white trianglesPart 3: 3+2+1 = 6 Part 4: 4+3+2+1 = 10...Part 50: 50+49+48+...+2+1 = n(n+1)/2 = 1275 white triangles.Also, number black triangles in part n = number of white triangles in part n+1.
1. 10 and 212. 1275same formula n(n+1)/2
Part 1: 1 white triangle
ReplyDeletePart 2: 2+1 = 3 white triangles
Part 3: 3+2+1 = 6
Part 4: 4+3+2+1 = 10
.
.
.
Part 50: 50+49+48+...+2+1 = n(n+1)/2 = 1275 white triangles.
Also, number black triangles in part n = number of white triangles in part n+1.
1. 10 and 21
ReplyDelete2. 1275
same formula n(n+1)/2