troubleshooting Question

Permutation and Combination - Number of selection of r things

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ExcellearnerFlag for United Kingdom of Great Britain and Northern Ireland asked on
Math / Science
2 Comments2 Solutions219 ViewsLast Modified:
Dear experts,

Can you please refer me to any online material/book which will demonstrate the application of the below rule with examples.
Please help.

Rule:Number of selection of r things (r<=n) out of n identical things is 1

Thank you
Senior Developer

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