- #1
ryt
- 9
- 0
[SOLVED] simple combinations problem
what is 12. combination of combinations with 3 elements of 1,2,3,4,5,6,7 ?
i tried step by step
123 - 124 - 125 - 126 - 127 - 134 - 135 - 136 - ... - and finaly i arrived at 12. witch is 147
is there a way to calculate it faster?, not step by step
Homework Statement
what is 12. combination of combinations with 3 elements of 1,2,3,4,5,6,7 ?
Homework Equations
The Attempt at a Solution
i tried step by step
123 - 124 - 125 - 126 - 127 - 134 - 135 - 136 - ... - and finaly i arrived at 12. witch is 147
is there a way to calculate it faster?, not step by step