Units digit of 7^5^6^13?

• (7^5) unit digit is 7
  7^6 unit digit is 9
  9^13 unit digit 9
  hence unit digit is 9.
  
• 9 years agoHelpfull: Yes(5) No(5)
• (7^5) unit digit=7 becoz 5/4 remainder=1 so 7^1=7.
  (7^6) unit digit=9 becoz 6/4 remainder=2 so 7^2=49
  (9^13) unit digit=9 becoz 13/2 rem=1 so 9^1=9
  note(if unit digit =2,3,7,8 then divide by 4 and if unit digit=4,9 divide by 2
• 9 years agoHelpfull: Yes(3) No(2)
• ans 9
  7^5=unit digit 7(cyclicity of 7 is 4)
  7^6=unit digit 9
  9^13=unit digit 9(bcz cyclicity of 9 is 2)
• 9 years agoHelpfull: Yes(2) No(4)
• (6^13) unit digit is 6
  5^6 unit digit is 5
  7^5 unit digit 7
  hence unit digit is 7.
• 7 years agoHelpfull: Yes(2) No(0)
• 5*6=0 SO ANS IS ZERO
• 7 years agoHelpfull: Yes(0) No(0)
• 0
  6*5=_0
  0*anything is zero in unit place
• 7 years agoHelpfull: Yes(0) No(0)