Simple code that calculates permutations, combinations, factorials, exponents, and binomial probability. TBA: hypergeometric probability, poisson, etc. SHORTHAND - p or npr for permutations - c or ncr for combinations - f for factorials - % for percent - e for exponents - b for binomial probability (probability of x successes in n trials) FAQ - x! factorial = 1 * 2 * 3 * ... * x - green flag to try another calculation - don't use this to cheat! any teacher worth their salt will make you show your work, so make sure you have your formulas memorized