Suppose we want to choose 5 letters, without replacement, from 14 distinct letters. (a) How many ways can this be done, if the order of the choices matters?
X
(b) How many ways can this be done, if the order of the choices does not matter?

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

Which of the following vectors are orthogonal to (2,1)? check all that apply