What is the remainder when (5^79) is divided by 7 ?
1). 1
2). 0
3). 5
4). 4

• 5^any no give unit digit---5 so rem will be 5/7 as 5.
• 10 years agoHelpfull: Yes(2) No(1)
• 5^n=unit digits are 5,5,5,5,5...upto n+1..
  So 5/7 Remainder is 5......
• 10 years agoHelpfull: Yes(2) No(1)
• remainder=(5^3)^36*5/7=(6^2)^18*5/7=(1)^18*5/7=1*5/7=-2
  so remainder=7-2=5
  remainder of 125/7=6
  remainder of 36/7=1
  
• 10 years agoHelpfull: Yes(0) No(2)
• unit digit of 5 pow any no it's unit digit will be always 5
  5/7 then remainder is 1
  ans:1
• 10 years agoHelpfull: Yes(0) No(1)