Common-Core/ Grade 9
Maths MCQ Based On Combination and permutation notation
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Common-Core Grade 9 - 9 Combination and permutation notation
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\\(_{}^{n}\\textrm{C}_{r }= \\frac{n!}{(n-r)!\\cdot r!} \\)
On first place we have 4 options ,on second we are left with 3 options and so nn
\\(_{}^{n}\\textrm{C}_{r }= \\frac{n!}{(n-r)!\\cdot r!} \\)
Use the formula for permutation and combination
\\(_{}^{n}\\textrm{P}_{r }= \\frac{n!}{(n-r)!} \\)
Use the formula \\(C_{5}^{4} X C_{6}^{2} +C_{5}^{3} X C_{6}^{3} +C_{5}^{2} X C_{6}^{4} \\)
\\(_{}^{n}\\textrm{C}_{r }= \\frac{n!}{(n-r)!\\cdot r!} \\)
use combination formula
There are 26 red cards, in the first place we 26 choices. On the second we are left with 25 choices.
At the first place we have 4 options for 4 letters of the word, At second place 3 options,and so on
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