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In how many ways 4 balls can be picked from 6 black and 4 green colored balls such that at least one black ball is selected?

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Important Questions on Permutations and Combinations

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AP EAPCET
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR MATHEMATICS>Chapter 16 - Permutations and Combinations>AP EAPCET - 20 Aug 2021 Afternoon>Q 19
A set contains 11 elements. The number of subsets of the set which contain at most 5 elements is