What was the day of the week on 26-January-1950?

Answer: Option C

Formula : (Date + Month code + No.of years + No.of leap year + Century code)/7
$$\begin{array}{rl}& =\frac{26+1+50+12+0}{7}\\ & =\frac{89}{7}\\ & =5\\ & =\text{Thursday}\end{array}$$