Question about Texas Instruments TI-83 Plus Calculator

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When I type 12!/5!7! I'm getting 2.01180672e10. My answer is suppose to be 792. Please help.

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Andrew Odenbreit

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First solve for 5! and put this in the memory. Then solve for 7! and multiply by 5! (the number in the memory). Then divide answer by 12!. Then use the 1/x key to invert the fraction. You will then get 792.

Posted on Jan 01, 2012

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Somehow you're calculating 12!/(5!/7!).

Press 1 2 MATH left-arrow 4 / 5 MATH left-arrow 4 / 7 MATH left-arrow 4 ENTER to calculate the desired value. Alternatively, you can press 1 2 MATH left-arrow 3 5 ENTER or 1 2 MATH left-arrow 3 7 ENTER to calculate the same thing.

Posted on Aug 10, 2011

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