form 8 digit numbers from 1,2,3,4,5 with repetition is allowed divisible by 4..

• no. is divisible by 4 if the no. formed by last two digits is divisible by 4.
  so last 2 digits must be
  12
  32
  52
  24
  44
  remaining 1st six digits can be arranged in 5^6 ways.
  therefore answer is 5^6+5^6+5^6+5^6+5^6 = 78125
• 11 years agoHelpfull: Yes(37) No(5)
• when repetition is allowed.
  the number is divisible by 4 when its last two digit is divisible by 4
  i.e. last two digits can be 12,24,32,44,52
  NOW
  if last two digit is 12 then 5^6 numbers are possible.
  hence for 24,32,44,52
  (five ways total)
  answer is 5^7 78125
• 11 years agoHelpfull: Yes(15) No(4)
• no. is divisible by 4 if the no. formed by last two digits is divisible by 4.
  so last 2 digits must be
  12
  32
  52
  24
  44
  now there are 8 places _ _ _ _ _ _ _ _
  Last two digit can be filled in 5 ways
  Since repetition is allowed 1st place can be filled in 5 ways, second place can also be filled in 5 ways....same for other 4 places.....so 5^6*5=78125 is the answer.
  remaining 1st six digits can be arranged in
• 11 years agoHelpfull: Yes(4) No(1)
• is it 5^7?
• 11 years agoHelpfull: Yes(3) No(4)
• 5^6*5=78125.
• 11 years agoHelpfull: Yes(3) No(1)
• no. is divisible by 4 if the no. formed by last two digits is divisible by 4.
  so last 2 digits must be
  12
  32
  52
  24
  44
  remaining 1st six digits can be arranged in 5^6 ways.
  therefore answer is 5^6+5^6+5^6+5^6+5^6 = 78125
• 11 years agoHelpfull: Yes(2) No(0)
• 62500 ????
• 11 years agoHelpfull: Yes(0) No(7)
• the answer shuld me 62500.
• 11 years agoHelpfull: Yes(0) No(6)
• there will be too many nos , i guess question should be no. of 8 digit nos
  just place last two digits so that sum of them is divisible by 4 and calculate no. of combinations
• 11 years agoHelpfull: Yes(0) No(2)
• no. is divisible by 4 if the no. formed by last two digits is divisible by 4.
  so last 2 digits must be
  12
  32
  52
  24
  44
  remaining 1st six digits can be arranged in 5^6 ways.
  therefore answer is 5^6+5^6+5^6+5^6+5^6 = 78125
• 11 years agoHelpfull: Yes(0) No(0)