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If it was Saturday on 12th Jan,1980, then what was the day on 12th Jan,1979?

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Today , $5^{th} April, 2018 \rightarrow Thursday$

$\qquad 5^{th} April, 2017 \rightarrow Wednesday$

$\qquad 5^{th} April, 2016 \rightarrow Tuesday$

$\qquad 5^{th} April, 2015 \rightarrow Sunday$

$\qquad 5^{th} April, 2014 \rightarrow Saturday$

Clearly, we can see that when we move down yearwise, a day decreases, but when a leap year came, $2$ day decreases.

Now, the year $1979$ being an ordinary year, it has $365$ days, means $1$ ODD day.

Now, $12^{th}Jan, 1979$ is $Saturday$.

From $12^{th}Jan, 1979$ to $12^{th}Jan, 1980$ is a total of $365$ days.

∴ $12^{th}Jan, 1979$ will be $1$ day before $Saturday$ & it will be  $\color{Orange}{Friday}$
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