The number of combinations of n objects, taken r at a time, is
Probability
If the probability that an event will occur is a, then the probability that the event will not
occur is 1 – a.
If the probability that one event will occur is a and the independent probability that another
event will occur is b, then the probability that both events will occur is ab.
Rules of Logarithms
Limit of an Algebraic Fraction
To find a limit of an algebraic fraction, first factor the numerator and denominator and
cancel any factors they have in common. Then plug in and evaluate.
Sequences Formulas
Arithmetic Sequences: