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Important Result for Permutation and Combination

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Important Result for Permutation and Combination

Topic Case Formula
Answering Questions One or more questions 2ⁿ − 1
  With alternatives 3ⁿ − 1
  All questions answered 2ⁿ
Lines from Points Lines from n points \[^nC_2\]
  If m points are collinear \[{}^{n}C_{2}-{}^{m}C_{2}+1\]
Triangles Total triangles \[^nC_3\]
  If m points are collinear \[^nC_3\] − \[^mC_3\]
Polygon Diagonals of an n-sided polygon \[^nC_2-n=\frac{n(n-3)}{2}\]
Handshakes Total handshakes \[^nC_2\]
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