Others Maths Puzzle

What is the probability of getting five Monday in a 31-days month ?

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Others Other Question

I have two coins.
* One of the coin is a faulty coin having tail on both side of it.
* The other coin is a perfect coin (heads on side and tail on other).
I blind fold myself and pick a coin and put the coin on table. The face of coin towards the sky is tail.

What is the probability that other side is also tail ?
7,35,...2373,16772