Question

Find the day of the week on $\text{16 January, 1969}$

• A. Thursday
• B. Monday
• C. Tuesday
• D. Friday

Answer 1

The correct option is A Thursday

$\Rightarrow 1600$ years have $0$ odd days .....(i)
$300$ years have $1$ odd day .....(ii)
$68$ years have $17$ leap years and $51$ ordinary years
$=(17\times 2+51\times 1)$
$=85\text{odd days}=1\text{odd day}$ ......(iii)
$\text{16 January}$ has $2$ odd days .........(iv)
Adding odd days,
$0+1+1+2=4\text{odd days}=\text{Thursday}$.