If Republic Day of India in 1980 falls on Saturday. Mohan was born on 3^rd March 1980 and Sohan is 4 day older to Mohan, then Sohan's birthday falls on:

Thursday

The correct answer is Option (2) → Thursday

If Republic Day of India in 1980 falls on Saturday.

MOHAN WAS BORN TO MARCH 3 , 1980

Sohan is 4 day older to Mohan, SOHAN WAS BORN 4 DAYS BEFORE MARCH 3 , 1980

AS 1980 IS A LEAP YEAR THERE ARE 29 DAYS IN FEB . SO SOHAN IS BORN ON  FEB 28 , 1980

NO OF DAYS BETWEEN  26 JAN  TO  28  FEB IS 33.

AND 33 DIVIDED BY 7 WE GET 5 AS REMAINDER

5 DAYS AFTER SATURDAY IS THURSDAY

SO 28 FEB THE DAY SOHAN WAS BORN  ON THURSDAY

HENCE THURSDAY IS CORRECT ANSWER