Using only the digits from 0 to 6 , how many 5 digit codes can be constructed, if the first digit can not be 4 and no digits is used more than once ?
Options
A. 1080
B. 2160
C. 7776
D. 720

• 5*6*5*4*3 = 1800
  
• 10 years agoHelpfull: Yes(28) No(4)
• code can be contain zero,(ex 0122---, 0731---)
  sw, we can consider 0 at first place.
  so it should be 6*6*5*4*3= 2160
• 10 years agoHelpfull: Yes(20) No(0)
• Sorry for my previous answer which was wrong.
  Correct answer is 1800.
  We have to form code of 5 digits using 7 digits from 0 to 6.
  _ _ _ _ _
  Number of ways to fill ten thousand place= 5 ; because we cant use 0 & 4 According to question. Use digits are 1,2,3,5,6.
  Number of ways to fill thousand place= 6 ; Use digits are 0,1,2,3,4,5 .One digit is used in ten thousand place.
  Number of ways to fill hundred place= 5 ; use digits are 0,1,2,3,4.
  Number of ways to fill ten place= 4 ;
  Number of ways to fill ones place= 3 ;
  Total Codes= 5*6*5*4*3=1800.
• 10 years agoHelpfull: Yes(18) No(6)
• 6*6*5*4*3=2160
• 10 years agoHelpfull: Yes(8) No(8)
• actual answer is 1800 but there is no option of 1800
• 10 years agoHelpfull: Yes(6) No(1)
• they are asking about 5 digit code,not about 5 digit number. so 0 also can come at starting position.
  
  so,answer will be, 6*6*5*4*3 = 2160 i.e. option B
• 10 years agoHelpfull: Yes(4) No(1)
• Ans. B
  because 6*6*5*4*3=2160.
• 10 years agoHelpfull: Yes(1) No(4)
• actual answer is 1800
• 10 years agoHelpfull: Yes(1) No(3)
• dummy question
  answer will be 1800
• 10 years agoHelpfull: Yes(1) No(0)
• it is written 5 digit code not 5 digt no
  6*5*4*3*2=720
• 10 years agoHelpfull: Yes(1) No(4)
• what is the diff betwn no.nd code plz explain
• 10 years agoHelpfull: Yes(1) No(0)
• 7P5(for all 5digit numbers)-6P4(starts with 4)=2160
• 10 years agoHelpfull: Yes(1) No(11)
• There can be 6 possible GP sequences:
  1 ,2 ,4 and 4, 2, 1
  2, 4, 8 and 8, 4, 2
  1, 3, 9 and 9, 3, 1
  Corresponding values for abs(a+b-c) are 1, 5, 2, 10, 5, 11
  so ans=6
  
• 10 years agoHelpfull: Yes(0) No(7)
• 1800
  dummy question
  
• 10 years agoHelpfull: Yes(0) No(1)
• 6*6*5*4*3=2160
• 10 years agoHelpfull: Yes(0) No(1)
• 7C5(for all 5digit numbers)-6C4(starts with 4)=2160
• 10 years agoHelpfull: Yes(0) No(10)
• actual answer=5*6*5*4*3=1800 because we can not use 0 at last place it will result a four digit no,bt
  there is no option then we it will be 6*6*5*4*3=2160
• 10 years agoHelpfull: Yes(0) No(2)
• 6*6*5*4*3=2160
  correct ans is 2160..
  
• 10 years agoHelpfull: Yes(0) No(5)
• code can be contain zero as initial digit........in case of 4 digit no zero cant be initial digit ...so ans is 2160
  
• 9 years agoHelpfull: Yes(0) No(0)
• 5*6*5*4*3=1800
• 9 years agoHelpfull: Yes(0) No(0)
• 5_4_3_2_6
  5*4*3*2*6=720
• 9 years agoHelpfull: Yes(0) No(1)
• ans is 720
  no digits used more than once
  5*6*4*3*2=720
• 9 years agoHelpfull: Yes(0) No(0)