Search found 2 matches
x can do work by 12 hours
y and z together can do the work by 15.18 / (15+18)
x : y+z = 12 : 15 . 18 / 33 = 2 : 15 / 11 = 22 : 15
- by DeepaVarma
Sun Jan 14, 2018 11:23 pm- Forum: Problem Solving
- Topic: og math # 130
- Replies: 132
- Views: 58257
TTT
Total 3 points' combinations = 9C3
nCr = n! / ((n-r)! . r!)
9C3 = 9! / 6!.3! = 9.8.7 / 3.2 = 84
Out of 84 combination , 8 will be straight lines
84 - 8 = 76
- by DeepaVarma
Fri Jan 12, 2018 1:02 am- Forum: Problem Solving
- Topic: How many triangles on the coordinate plane
- Replies: 131
- Views: 80066