HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 78
Probability Functions, Factorial, Gamma, Probability
UPC - 082916001456
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Probability Functions Factorial To calculate the factorial of a displayed non-negative integer x (0 ≤ x ≤ 253), press { (the left-shifted key). Gamma To calculate the gamma function of a noninteger x, Γ(x), key in (x - 1) and press { . The x! function calculates Γ(x + 1). The value for x cannot be a negative integer. Probability Combinations To calculate the number of possible sets of n items taken r at a time, enter n first, { \, then r (nonnegative integers only). No item occurs more than once in a set, and different orders of the same r items are not counted separately. Permutations To calculate the number of possible arrangements of n items taken r at a time, enter n first, { _, then r (nonnegative integers only). No item occurs more than once in an arrangement, and different orders of the same r items are counted separately. Seed To store the number in x as a new seed for the random number generator, press | i. Random number generator To generate a random number in the range 0 ≤ x < 1, press | k. (The number is part of a uniformly-distributed pseudo-random number sequence. It passes the spectral test of D. Knuth, The Art of Computer Programming, vol. 2, Seminumerical Algorithms, London: Addison Wesley, 1981.) 4-14 Real-Number Functions