Father & Son riddle
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Two fathers and two sons sat down to take tea. They had exactly three cup of tea, each person had a cup of tea. Explain how? 
one is grandfather
one is father
and one is son. they take 3 cup of tea
Suppose A is a person and B is the father of A. another person C is the father of B. so here you can see there are only Three persons A, B, C but there are two sons A, B ( A is the son of B and B is the son of C) and there are two father B, C (B is the father of A and C is the father of B).
There was only three people to begin with, one grandfather, one father, and one son. This equates to two fathers and two sons.
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