Vignesh was born in the month of October of a particular year. What is the probability that he was born on a Sunday?

Q. Suresh was born on $4^{th}$ October 1999. Shashikanth was born 31 days after Suresh. If Independence day fell on Sunday that year, on which day was Shashikanth born?

Q. In which month of the year was Mohan born?
Statement I. Mohan was born in winter.
Statement II. Mohan was born exactly fourteen months after his elder sister, who was born in October.

Q. Suresh was born on 4th October, 1999. Shashikanth was born 5 days before Suresh. If Independence Day fell on Sunday that year, which day was Shashikanth born?

Q. The probability that any one person selected at random was born on a Monday is 1/7. What is the probability, to the nearest percent, that of any 7 persons chosen at random, exactly one was born on a Monday?

Q. On which day in April is Gautam's birthday?
Statements:
1. Gautam was born exactly 28 years after his mother was born.
2. His mother will be 55 years 4 months and 5 days on August 18 this year.