1.

An integer is chosen at random and squared. The probability that the last digit of the square is 1 or 5 is                 [AMU 1999]

A.                 \[\frac{2}{10}\]    
B.                 \[\frac{3}{10}\]
C.                 \[\frac{4}{10}\]    
D.                 \[\frac{9}{25}\]
Answer» C.                 \[\frac{4}{10}\]    


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