Using the digits 1,5,2,8 four digit numbers are formed and the sum of all possible such numbers.

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h2006469

  • Jan 20th, 2008
 

possible four digit combinations = 4! = 24
sum of digit = 1+5+2+8 = 16
sum of all possible such no = 16*24= 384

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24 numbers can be formed. 1528,1582,1258,1285,1825,1852,2158,2185,2581,2518,2851,2815,5128,5182,5218,5281,5812,5821,8152,8125,8512,8521,8215,8251.

each number comes 6 times in unit, 10's, 100's and 1000th places.

The sum is 106656

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Tharunacs

  • Jan 9th, 2011
 

There are 24 numbers and the sum is 106,656.

1258
1285
1528
1582
1825
1852
2158
2185
2518
2581
2815
2851
5128
5182
5218
5281
5812
5821
8125
8152
8215
8251
8512
8521

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badriranjith

  • Nov 25th, 2011
 

1,5,2,8

4*(4!)=4*(1*2*3*4)

=96


therefore 1000*96 + 100*96 + 10*96 +96 = 106656

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lohitha

  • Jan 5th, 2012
 

Change the symbol
96+96(10)+96(100)+96(1000)

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Suhashini

  • Sep 15th, 2016
 

Why we have to multiply the digits with 6?

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