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+--- Thread: HP 10BII Combination Permutation (/thread-17235.html)
HP 10BII Combination Permutation - Gamo - 07-11-2021 05:29 AM
HP 10BII+ got this functions but not for the HP 10BII
HP 10BII User Manual doesn't provide the way to calculate this and
here is my attempt.
Formulas:
Permutation: nPr = n! ÷ [ (n - r)! ]
Combination: nCr = n! ÷ [ r! x (n - r)! ]
Example:
6P3
6 [-] 3 [=] [n!] [÷] 6 [n!] [SWAP] [=] display answer 120
6C3
6 [-] 3 [=] [n!] [x] 3 [n!] [=] [÷] 6 [n!] [SWAP] [=] display answer 20
Remark:
The Factorial Function limit is up to 253! = 5.17 E499
Gamo 7/2021
RE: HP 10BII Combination Permutation - Gamo - 07-21-2021 08:10 AM
Update key steps for both the "Combination and Permutation" by the use
of the memory key [→M]
Example:
►A child has a set of toy blocks with the 26 letters of the alphabet each appearing once.
How many different three-letter permutation ( 26P3 ) can be made with these blocks?
26 [→M] [-] 3 [=] display 23.00 [n!] display 2.59 E22 [÷] [RM] [n!] display 4.03 E26
[SWAP] [=] display answer 15,600.00
►A manager wants to choose a committee of three people from the seven engineers working for him.
In how many different ways cn the committee be selected? ( 7C3 )
7 [→M] [-] 3 [=] display 4.00 [n!] display 24.00 [x] 3 [n!] [=] display 144.00
[÷] [RM] [n!] display 5,040.00 [SWAP] [=] display answer 35.00
Gamo