HP 15c Scientific r, O´#, l´#, −0.0000, possible, above seed, 270,725.0000, (x) at a time, (random number), Number of different hands, Fifty-two(y) cards dealt four

48 Section 4: Statistics FunctionsHow many different four-card hands can be dealt from a deck of 52 cards?

Keystrokes	Display
52 v4	4	Fifty-two (y) cards dealt four
		(x) at a time.
c	270,725.0000	Number of different hands
		possible.

The maximum size of x or y is 9,999,999,999.

Random Number Generator

Pressing ´# (random number) will generate a random number (part of a uniformly distributed pseudo-random number sequence) in the range 0 ≤ r <1.*

At initial power-up (including reset of Continuous Memory), the HP-15C random number generator will use zero as a ―seed‖ to initiate a random number sequence. Any time you generate a random number, that number becomes the seed for the next random number. You can initiate a different random number sequence by storing a new seed for the random number generator. (Repetition of a random number seed will produce repetition of the random number sequence.)

O´#will store the X-register number (0 ≤ r < 1) as a new seed for the random number generator. (A value for r outside this range will be converted to fit within the range.)

l´#will recall to the display the current random number seed.

Keystrokes	Display
.5764	0.5764	Stores 0.5764 as random number seed.
O´	0.5764	(The ´keystroke may be omitted.)
#
´#	0.3422	Random number sequence initiated by the
´#	0.2809	above seed.

−0.0000

*Passes the spectral test (D. Knuth, The Art of Computer Programming. Vol. 2. Seminumerical Algorithms, Third Edition, 1998).