If 2 ^ 51 = .........?, then ? =
a) 1 b) 2 c) 4 d) 8

• 2^1=2
  2^2=4
  2^3=8
  2^4=16
  units place for powers of two goes like this-> 2 4 8 6 again 2 4 8 6
  divide 51/4 -> remainder=3
  3rd no. in 2's power series is 8.
• 13 years agoHelpfull: Yes(53) No(4)
• If you are asking digit at unit place of 2 ^ 51, answer is 8.option d).
• 13 years agoHelpfull: Yes(27) No(7)
• THANKS DIMPLE U R RIGHT..............
• 13 years agoHelpfull: Yes(7) No(2)
• 2^x last digit can be i)2 ii)4 iii)8 iv)6. Four cycled.
  51/4 leaves remainder 3.
  so last digit of 2^51 is iii)8
• 13 years agoHelpfull: Yes(3) No(1)
• unit place of 2 ^ 51, answer is 8.option d)
  
• 10 years agoHelpfull: Yes(1) No(2)
• 2^4 at unit place 6 comes
  then we make it easier 2^48 *2^3
  in 2^48 case unit digit will be 6
  so eq. is _ _ _6 *2^3=_ _6 * 8=48
  Ans . is 8
• 10 years agoHelpfull: Yes(1) No(2)
• last digit of 2 divisor:2,4,6,8,0
  so, ans->2
• 10 years agoHelpfull: Yes(0) No(12)
• option d is correct
• 8 years agoHelpfull: Yes(0) No(0)