Q. How many 2 digit number satisfy the following. that last digit of the square of the 2 digit number is 8

Option
a) None
b) 1
c) 2
d) 3
e) More than three

• A. none
  
  as no perfect square is having last digit as 8.
• 12 years agoHelpfull: Yes(13) No(0)
• a) None
  
  _ _1^2=1 (last digit)
  _ _2^2=4 (last digit)
  _ _3^2=9 (last digit)
  _ _4^2=6 (last digit)
  _ _5^2=5 (last digit)
  _ _6^2=6 (last digit)
  _ _7^2=9 (last digit)
  _ _8^2=4 (last digit)
  _ _9^2=1 (last digit)
  _ _0^2=0 (last digit)
  
  we found that last digit of a square no. is 1,4,5,6,9, 0.
  hence there is no number such that the last digit of square of that number is 8.
• 10 years agoHelpfull: Yes(4) No(0)