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The sum of the digits in the unit place ...

The sum of the digits in the unit place of all numbers formed with the help of 3,4,5,6 taken all at a time is

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Sum of the digits in the unit's place
`=(4-1)!(3+4+5+6)=6xx18=108` .
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ARIHANT MATHS-PERMUTATIONS AND COMBINATIONS -Exercise (Questions Asked In Previous 13 Years Exam)
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  2. There is a rectangular sheet of dimension (2m-1)xx(2n-1), (where m > 0...

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  3. If the letters of the word SACHIN are arranged in all possible ways ...

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  4. lf r, s, t are prime numbers and p, q are the positive integers such t...

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  5. At an election a voter may vote for nany number of candidates , not gr...

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  6. The letters of the word COCHIN are permuted and all the permutation...

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  7. The set S""=""{1,""2,""3,"" ,""12) is to be partitioned into three...

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  8. Consider all possible permutations of the letters of the word ENDEANOE...

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  9. How many different words can be formed by jumbling the letters in the ...

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  10. In a shop, there are five types of ice-creams available. A child buys ...

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  11. The number of seven digit integers, with sum of the digits equal to 10...

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  12. From 6 different novels and 3 different dictionaries, 4 novels and ...

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  13. There are two urns. Urn A has 3 distinct red balls and urn B has 9 d...

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  14. Statement-1: The number of ways of distributing 10 identical balls in ...

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  15. There are 10 points in a plane, out of these 6 are collinear. The numb...

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  16. The total number of ways in which 5 balls of differert colours can be ...

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  17. Let n denote the number of all n-digit positive integers formed by the...

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  18. Let a(n) denote the number of all n-digit numbers formed by the digits...

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  19. Assuming the balls to be identical except for difference in colours, t...

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  20. Let Tn be the number of all possible triangles formed by joining ve...

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  21. Consider the set of eight vector V={a hat i+b hat j+c hat k ; a ,bc in...

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