Discussion
The calendar of year 1989 was same as which year?
Answer: A
Look backwards from 1989 until the odd days total a multiple of seven.
\[ 1988:2,\ 1987:1,\ 1986:1,\ 1985:1,\ 1984:2,\ 1983:1,\ 1982:1,\ 1981:1,\ 1980:2,\ 1979:1,\ 1978:1 \]
\[ \text{total} = 14 \quad\Longrightarrow\quad 0 \text{ odd days} \]
So 1989 repeats the calendar of 1978.
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