Simple Probability Question [*RESOLVED*]

[getnandu]

Hi !

I am not good at maths like you experts, that why I am taking Maths classes.
Recently I came across the following two Probability questions and i am not able to figure out how to solve them.

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Q1.) If four coins are tossed, find the probability of
the occurrence of 2 heads and 2 tails ?

Q2.) The odds that a book will be favourably reviewed by
three independent critics are 3 to 2, 4 to 3 and 2 to
3 respectively. What is the probability that of the
three reviews majority will be favourable?
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Any Help will be appreciated.

Thanks
Nandu