Question about Texas Instruments TI-30 Xa Solar Calculator

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TI-30x How do I use the nCr function? - Texas Instruments TI-30 Xa Solar Calculator

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Input n, press 2nd [nCr], input r, press =.

For example, to calculate the number of thirteen-card bridge hands that can be dealt from a deck of 52 cards:
5 2 2nd [nCr] 1 3 =

Posted on Sep 15, 2010

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SOURCE: How to do nPr or nCr on TI-30x Solar (scientific calc.)

If you have an older version on the TI30x Solar (not TI30Xa or newer) then you must use a different key sequence for nPr/nCr.

52 [2nd][x/y] 5 [2nd][nCr] gives 2598960 (the x/y button is above the Pi symbol on my version).
8 [2nd][x/y] 3 [2nd][nPr] gives 336

This took me forever to find out, so hopefully it will help someone!

Posted on Jun 28, 2010

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SOURCE: How do you enter a combination on the TI 30X. nCr?

Enter the value n. Press 2ND then nCr. Enter the value r. Press the = key.

Posted on May 20, 2010

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SOURCE: How do I enter a combination of (10,4) on a TI=30X

Enter the value n. Press 2ND then nCr. Enter the value r. Press the = key.

You can download a Guidebook from http://education.ti.com

Posted on May 20, 2010

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How do I use ncr function?


To calculate the number of combinations of n items taken r at a time, enter n, press x-y, enter r, then press 3rd [nCr] =. For example, to find the number of possible five-card poker hands, press
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x-y is the x-exchange-y key just below the blue 2nd key.

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How do you enter a combination on the TI 30X. nCr?


Enter the value n. Press 2ND then nCr. Enter the value r. Press the = key.

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How do I enter a combination of (10,4) on a TI=30X


Enter the value n. Press 2ND then nCr. Enter the value r. Press the = key.

You can download a Guidebook from http://education.ti.com

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1 Answer

Can you calculate nCr ?


Yes. Use the 2nd [nCr] function.

52 2nd [nCr] 5 = will calculate the number of 5-card poker hands that can be dealt from a deck of 52 cards.

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A Committee has 19 members, of which 10 are Democrats and 9 are Republicans. A subcommittee is going to be formed with 3 Democrats and 3 Republicans. How many possible subcommittees can be formed?


How many ways can you select 3 members out of 9 republicans: nCr (9,3)
How many ways can you select 3 members out of 10 democrats: nCr(10,3)
For each single choice of 3 reps you have 1*nCr(10,3) possible subcommittees.
Hence the total number of possible suncommittes is nCr(9,3)*nCr(10,3)
Explictitly
# of possible subcommittees is [9!/(3!*6!)]*[10!/(3!*7!)] or 10080

To calculate you can use the explict formula above or use the nCr function of your calculator

To access the nCr( function press [2nd][5] (MATH) [7:Probability][3:nCr]

You can also just type the name of the command respecting the case ( C must be upper case)
d0e8f2d.png

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2 Answers

How to do nPr or nCr on TI-30x Solar (scientific calc.)


If you have an older version on the TI30x Solar (not TI30Xa or newer) then you must use a different key sequence for nPr/nCr.

52 [2nd][x/y] 5 [2nd][nCr] gives 2598960 (the x/y button is above the Pi symbol on my version).
8 [2nd][x/y] 3 [2nd][nPr] gives 336

This took me forever to find out, so hopefully it will help someone!

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Combinations graph


you need to follow your user guide for calculaing nCr function

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