in how many ways we can make a 4 digit no. using 1,2,3,4 and what's the sum of all the numbers obtained?(repeatations not allowed)

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2 Answers
Himanshu Giria
·20131215 05:43:23
4!=24ways
 Chandra Prakash Mishra please read the full questionUpvote·0· Reply ·20131215 23:16:12
Manish Shankar
·20131217 22:34:58
There will be 24 numbers.
out of these 24, 6 will have 1 in unit digit, 6 will have 2 in unit digit, 6 will have 3 in unit digit and 6 will have 4 in unit digit.
Similar things can be said about the other digits.
Sum of number at unit digit=6*(1+2+3+4)=24
Sum of number at tens digit=6*(1+2+3+4)=24\
Their contribution to the sum will be 24*10=240
Similarly at hundredth digit sum is 24*100
Continue to get the answer
 Chandra Prakash Mishra thank you