- #1
haribol
- 52
- 0
How many ways can you select four letters out of the word parallelogram ?
The answer on the book is 150. For me I am stuck at using 8C4 and it seems to be the logical way. The reason I chose 8 is because some letters are repeating. So how can they have 150?
The answer on the book is 150. For me I am stuck at using 8C4 and it seems to be the logical way. The reason I chose 8 is because some letters are repeating. So how can they have 150?