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A (6)-place code is formed from (4) distinct letters and (5) distinct digits, with at least (2) letters and no symbol repeated. How many codes are possible?

Answer and explanation

Correct answer: (22200)

Take the number of letters as (2,3,4), then arrange positions, letters and digits separately. In mixed codes, first choose the position types.

Related tags

PermutationsCodesMixed SymbolsPermutations And CombinationsMathematicsClass 11 Mcq

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