Flashcards in Math review Deck (21):
any integer divisible by 2
is even integer
any integer not divisible by 2 is
if at least one factor is even, the the product is
if both are odd, then product is
if both integers are even or odd, then sum/differene is
if one integer is even and other is odd, then sum/difference is
sum of the interior angles of a polygon equation
working together or alone rate problem formula:
1/r + 1/s = 1/h
each variable is in hours
interest problem: simple annual int formula
princ * interest rate * time
gross profit =
revenues - cost
sq rt (1)
Permutation, single source, order matters
for a problem that asks you to choose from the same source to fill specific spots, all you have to do is multiply the number of choices for each of the spots - but the number of choices keeps getting smaller.
3 basketball teams play in a league against each other. At the end of the season, how many different ways could the 3 teams end up against each other?
3*2*1 = 6
6 horses in race. how many different groups of horses make up the top 3 horses?
groups = combination
n! / r! (n-r)!
6! / 3! * 3!