Rule of Sum and Rule of Product
How many triangles are there in the diagram above?
by
Abdulrahman El Shafei
In the single-elimination NCAA Tournament, 64 teams compete in 6 bracketed rounds. How many games are there in total?
by
Zandra Vinegar
How many 4 -digit positive integers have 2 or more zeroes?
by
Jay Steller
How many parallelograms are formed when a set of 5 parallel lines intersects a set of 4 parallel lines?
Details and Assumptions
- All parallel lines are extended indefinitely.
by
dinesh R
How many triangles are there in the above image?
by
Calvin Lin