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HI I got 2 questions repeated in the same Practise test, Is it a glitch?

In a family gathering there are two males who are grandfathers and four males who are fathers. In the same gathering there are two females who are grandmothers and four females who are mothers. There is at least one grandson or a grand-daughter present in this gathering. There are two husband-wife pairs in this group. These can either be a grandfather and a grandmother, or a father and a mother. The single grandfather (whose wife is not present) has two grandsons and a son present. The single grandmother (whose husband is not present) has two grand-daughters and a daughter present. A grandfather or a grandmother present with their spouses does not have any grandson or grand-daughter present. What is the minimum number of people present in this gathering? Here WHen we are considering a grandfather is the same person included as a father while counting???

Hi, I am an IT guy with 2 years of Work-ex. I am aspiring for CAT - 2016. It would be of great help if anyone can share his/her views and ideas on how to start preparing for this exam?