Ajeweler has 15 diamond pendants and will display 4 of them from left to right in a glass case. in how many ways can he select and display the 4 pendants?
a) 32760
b) 360360
c) 3520
d) 30030

A

Step-by-step explanation:

Essentially, the definition of permutation is that the number of ways of selecting r things from a total of n things. THe formula is:

Where n! means n * (n-1) * (n-2) * ....

Here the total number of things is 15 diamond pendants (n = 15) and we need to select 4 diamond pendants (r = 4). plugging these into the permutation formula gives us the answer.

correct answer is A

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation: