# Pre Calc

The symbol nCr, rea "n choose r" or "the number of combinations of n things taken r at a time" is the number:

n!
-----
r!(n-r)!

a:find 4C1
b:Find 5C0 and 5C5
c: Find 7C1, 7C2, 7C3

1. What is your question on this? The formula gives the algorithm.

posted by bobpursley
2. a)4!/1!(4-1)!=4 x 3 x 2/3 x 2, cancel out the 3's and 2's=4
You do b and c. Post your answers if you'd like them checked.

posted by Jen

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The content structure of the passage includes a mathematical question and a partial answer provided by a user, followed by a response from another user with a solution for one part of the question and a suggestion to solve the
remaining parts.
multiple_questions_with_answers
Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
system
# Pre Calc

The symbol nCr, rea "n choose r" or "the number of combinations of n things taken r at a time" is the number:

n!
-----
r!(n-r)!

a:find 4C1
b:Find 5C0 and 5C5
c: Find 7C1, 7C2, 7C3

1. What is your question on this? The formula gives the algorithm.

posted by bobpursley
2. a)4!/1!(4-1)!=4 x 3 x 2/3 x 2, cancel out the 3's and 2's=4
You do b and c. Post your answers if you'd like them checked.

posted by Jen

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2. ### combinations help

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user
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TYPE: MULTIPLE_QUESTIONS_WITH_ANSWERS