Q. Find the total number of four digit numbers that can be formed using the digits 1,2,5,6.

• no. will be formed by taking all at a time with repititon allowed
  total=4*4*4*4=256
• 10 years agoHelpfull: Yes(32) No(7)
• unit place can we fill by any number so 4 ways of filling
  ten place filled any of remaining 3 numbers
  hundreds place filled any of remaining 2 numbers
  last we have 1 number
  required number=4*3*2*1=24
• 10 years agoHelpfull: Yes(31) No(7)
• If repitition is allowed then 4*4*4*4=256
  If repitition is not allowed then 4*3*2*1=24
• 10 years agoHelpfull: Yes(29) No(0)
• sum of four digit numbers that can be formed from 1,2,5,6?
  
  total no. formed = 4!=4*3*2*1=24
  starting with 1 = 3*2= 6 no.s
  starting with 2 = 3*2= 6 n0.s
  starting with 5 = 3*2= 6 no.s
  starting with 6 = 3*2= 6 no.s
  sum of digits starting with 1,2,5,6 = 6*1+6*2+6*5+6*6=6*(1+2+5+6)=84
  this sum will be same for hundred, tens & unit places
  
  sum of all 4 digit numbers formed using digits 1,2,5,6
  = 1000*84+100*84+10*84+84
  =84*(1000+100+10+1)
  =84*1111
  =93324
  
  
• 10 years agoHelpfull: Yes(24) No(15)
• In this question they didn't mentioned that the repetetion of number is not allowed.
  so if repetetion allowed then the answer should be 4*4*4*4=256;
  If repetetion not allowed then answer is 4*3*2*1=24;
• 10 years agoHelpfull: Yes(9) No(0)
• (4-1)!(1111)(1+2+5+6)
• 10 years agoHelpfull: Yes(6) No(0)
• Please correct the question as:find the total sum of four digit numbers that can be formed from 1,2,5,6?
• 10 years agoHelpfull: Yes(3) No(0)
• 4! = 4*3*2*1 = 24
• 10 years agoHelpfull: Yes(1) No(0)
• 4p4 = 4!/0! =24
• 10 years agoHelpfull: Yes(1) No(0)
• generalized formula:
  (n-1)!(11111.....)(sum of digits)
  [(total number of numbers - 1)(1's equal to numbers of digits)(sum of given digits)
• 10 years agoHelpfull: Yes(1) No(0)
• if reapetation is allowed then 256 else 24
• 10 years agoHelpfull: Yes(1) No(0)
• 3!*3!*3!*3!
• 10 years agoHelpfull: Yes(0) No(3)
• Raghav gupta's ans is right..
• 10 years agoHelpfull: Yes(0) No(0)
• @Nishant Nishikar bhai tumhara solution 100% correct hain .....
• 10 years agoHelpfull: Yes(0) No(0)
• Since repetition is allowed so each place can be filled in 4 ways.
  Total = 4^4 = 256
• 9 years agoHelpfull: Yes(0) No(0)
• case 1(without repeat) : 4 digit number to be formed from 4 digit(1,2,5,6) = 4*3*2*1 = 24
  case 2(with repeat) : 4*4*4*4= 4^4=256
• 9 years agoHelpfull: Yes(0) No(0)
• thousand place*hundreds place*tens place*unit place=4*3*2*1=24 .
• 9 years agoHelpfull: Yes(0) No(0)