The number in the unit's place when 7 is raised to the power of 173 is?

• ans 7^173 has the unit digit of 7.
• 12 years agoHelpfull: Yes(4) No(4)
• first observe the pattern:
  7^1=7
  7^2=49
  7^3=343
  7^4=2401
  7^5=16807
  
  unit digit pattern is like: (7,9,3,1), (7,9,3,1),.....and so on.
  so 173%4=1 i.e remainder=1
  it means in last group ( of 4 elements) we have only one element .
  and we know unit digit of first element of each group is 7.
  
  ANS: 7
• 8 years agoHelpfull: Yes(1) No(0)