THERE ARE 6 BOOKS THAT BETH WOULD LIKE TO HAVE AT THE BOOK FAIR BUT HER MOM SAID SHE COULD ONLY GET 4. HOW MANY DIFFERENT COMBINATIONS OF 4 BOOKS COULD BETH GET FROM THOSE 6?
see my response to "Betty at 2:12 am"
To find the number of different combinations of 4 books that Beth could get from the 6 books she wants at the book fair, we can use the concept of combinations.
To calculate the number of combinations, we can use the formula for combinations: nCr = n! / (r!(n-r)!), where n is the total number of items available (in this case, 6 books) and r is the number of items we want to choose (in this case, 4 books).
So, applying the formula, we have:
6C4 = 6! / (4!(6-4)!)
= 6! / (4!2!)
= (6 * 5 * 4!) / (4! * 2)
= (6 * 5) / 2
= 30 / 2
= 15
Therefore, there are 15 different combinations of 4 books that Beth could get from the 6 books at the book fair.