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General
Easy

Question

Assertion: The sum of all4 digited numbers that can be formed using the digits 1,2,4,5,6 without repetition is 479952
Reason: Sum of all r‐digit numbers formed by taking the given n digits (without zero) is (sum of all the n digits) cross times left parenthesis n minus left parenthesis A right parenthesis blank P subscript r minus 1 end subscript cross times( 111 horizontal ellipsis. r times).

  1. A is true, R is true and R is the correct explanation for A    
  2. A is true, R is false and R is the not the correct explanation for A    
  3. A is true, R is false    
  4. A is false, R is true.    

The correct answer is: A is true, R is true and R is the correct explanation for A


    A equals 4 subscript P subscript 3 end subscript end subscript cross times left parenthesis 1 plus 2 plus 4 plus 5 plus 6 right parenthesis cross times 1111 equals 279952

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