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The calendar of the year 2006 was used before in the year?

  • A.1990
  • B.1995
  • C.2002
  • D.2000

Answer: B

Count odd days backwards from 2006 until they reach a multiple of seven.

\[ 2005:1,\ 2004:2,\ 2003:1,\ 2002:1,\ 2001:1,\ 2000:2,\ 1999:1,\ 1998:1,\ 1997:1,\ 1996:2,\ 1995:1 \]

\[ \text{total} = 14 \quad\Longrightarrow\quad 0 \text{ odd days} \]

So the 2006 calendar had been used in 1995.

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