how many 5 digit nos can be formed with digits 1,2,3,4,5,6 which are divisible by 4 and digits not repeated?

• last 2 digits should is divided by 4 then we can say number is divided by 4
  we have 8 ways in filling last 2 blanks 12,16,24,32,36,52,56,64 now we are left with 3 blanks already 2 numbers are taken so there are 4 numbers so 1st blank filled in 4ways,2nd in 3,3rd in 2
  so 4*3*2*8=192
• 12 years agoHelpfull: Yes(32) No(3)
• 192 numbers can be formed
  
  Last 2 digits must be 12,16,24,32,36,52,56,64 = 8 ways
  
  Remaining 3 digits in 4*3*2 = 24ways
  
  Total = 24*8 = 192 ways
• 12 years agoHelpfull: Yes(18) No(2)
• Test of divisibility by 4 is that the last two digits should be divisible by 4.
  
  1 : When the last 2 digits are 12, i.e., _ _ _ 12 = 4 * 3 * 2 = 24 numbers
  
  2 : When the last 2 digits are 16, there are 24 numbers
  
  3 : When the last 2 digits are 24 there are 24 numbers
  
  4 : When the last 2 digits are 32 there are 24 numbers
  
  5 : When last 2 digits are 36 there are 24 numbers
  
  6 : When last 2 digits are 52 there are 24 numbers
  
  7 : When last 2 digits are 56 there are 24 numbers
  
  8 : When last 2 digits are 64 there are 24 numbers
  
  Total = 8 * 24 = 192
• 12 years agoHelpfull: Yes(4) No(1)
• hello item
• 12 years agoHelpfull: Yes(2) No(0)
• Let the speed of the stream be x km/hr. Then,
  Speed downstream = (15 + x) km/hr,
  Speed upstream = (15 - x) km/hr.
  30 + 30 = 4 1
  (15 + x) (15 - x) 2
  900 = 9
  225 - x2 2
  9x2 = 225
  x2 = 25
  x = 5 km/hr.
  
• 10 years agoHelpfull: Yes(1) No(1)