HP 35s HP 35s scientific calculator - User Guide - Page 89
Probability Functions, Factorial, Gamma, Probability - how to enter algorithm
UPC - 000000000000
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Probability Functions Factorial To calculate the factorial of a displayed non-negative integer x (0 ≤ x ≤ 253), press * (the right-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, x, 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 . Random number generator To generate a random number in the range 0 < x < 1, press . (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.) Real-Number Functions 4-15