how all work. Mary purchased a package of 15 different plants, but she only needed 10 plants for planting. In how many ways can she select the 10 plants from the package to be planted?

Question

how all work. Mary purchased a package of 15 different plants, but she only needed 10 plants for planting.  In how many ways can she select the 10 plants from the package to be planted?

anonymous · Answer

$$15*14*13*12*11*10*9*8*7*6$$

anonymous · Answer

so you take and multiply each number?

anonymous · Answer

15 * 14 * 13 * 12 * 11 * 10 * 9 * 8 * 7 * 6

You ca plug straight from the formula: C15,10 = 15 ! / (15 - 10) !

anonymous · Answer

since there are 15 different plants, and one can only be used once each time you take one out you have one less, so there are left with 15-n left, since it is only needed for 10 of them once u get to the 10th term, you stop multiplying them

anonymous · Answer

ok .. now im confused...

anonymous · Answer

ana2 that is not C15,10 or 15 C 10 or 
$$\dbinom{15}{10}$$

anonymous · Answer

your answer is right however.

anonymous · Answer

i think you meant to write 15P10 or P15,10

anonymous · Answer

You're right, it was a careless mistake. Sorry to sandii.

anonymous · Answer

so the answer would be 15 * 14 * 13 * 12 * 11 * 10 * 9 * 8 * 7 * 6  15P10 or P15,10