Q. How many odd numbers less than 1000 can be formed using the digits 0, 2, 5, 7? (repetition of digits is allowed ?

• odd numbers less than 1000
  3 digit no.=3*4*2=24
  2 digit no.=2*3=6
  1 digit no.=2
  so total odd no. less than 1000 =24+6+2=32
  ans 32
• 10 years agoHelpfull: Yes(10) No(2)
• i think 14
• 10 years agoHelpfull: Yes(2) No(6)
• 3digit no.- 3*4*2=24
  2digit no.- 3*2=6
  1digit no.- 2(odd, 5 nd 7)
  
  Total= 24+6+2=32
• 10 years agoHelpfull: Yes(1) No(1)
• 3*4*2=24
  any digit except 0 can come at first place so 3 ways
  then any digit at tens place so 4 ways
  either 0 or 2 at units place so 2 ways
  3*2*4=24
• 10 years agoHelpfull: Yes(0) No(3)
• 32
  For three digit odd numbers _ _ _ the first place cannot be filled by 0. other three can fill. Second place can be filled by all 4. Third place cannot be filled by either 2 or 0. So, 3*4*2=24.
  For two digit odd numbers _ _. First place cannot be filled by 0. Other three can fill. Second place can be filled either by 5 or 7. So 3*2=6.
  For single digit odd numbers it can either be 5 or 7. so 2.
  24+6+2=32
• 10 years agoHelpfull: Yes(0) No(1)
• ans=48
  3 digit=3
  2nd digit=4
  1st digit=4
  so total odd no=4*4*3=48
  
  
• 10 years agoHelpfull: Yes(0) No(2)
• very easy, 1c1*4c1*4c1*2c1 =32.
  1c1 bwcause anything without 0 will make it more than 1000 & 2c1 because with only 5 or 7 the number will be odd.
• 9 years agoHelpfull: Yes(0) No(0)
• 32 :)
  confirm !
• 9 years agoHelpfull: Yes(0) No(0)
• three digit number:
  last no must be 5,7 only 2 option is possible.
  way=4*4*2=32.
• 9 years agoHelpfull: Yes(0) No(0)
• Places: 4th place 3rd place 2nd place unit pace
  nos can be placed: 0 0,2,5,7 0,2,5,7 5,7
  possibilities: 1 4P1=4 4P1=4 2P1=2
  Total no of odd nos = 1+4+4+2 = 11
  
• 9 years agoHelpfull: Yes(0) No(0)
• Its a based on P & C, 4 boxes are there.
  1.first box can be filled in 1 ways ( 0 )
  2. Second box can be in 4 ways
  3. Third box can be in 4 ways.
  4.Fourth box can be in 2 ways (5 & 7)
  
  Thus total permutation = 1*4*4*2
  = 32
• 6 years agoHelpfull: Yes(0) No(0)