A choir consists of 9 sopranos and 8 baritones. How many ways can the choir director select a group of 5 sopranos and 7 baritones for a special song? a. 1008
b. 134
c. 6188
d. 1,352,078

Which of the following expressions are equivalent ?

Proceed as in example 3 in section 6.1 to rewrite the given expression using a single power series whose general term involves xk. ∞ n(n − 1)cnxn − 2 n = 2 − 4 ∞ ncnxn n = 1 + ∞ cnxn n = 0

Drag the tiles to the boxes to form correct pairs. not all tiles will be used. match each set of vertices with the type of quadrilateral they form