exam Maths Puzzle Numerical Ability

Five fair coins are tossed. Find the probability of obtaining 4 heads and
1 tail.

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RAY HAS $7.60 IN QUARTERS AND DIMES. IN ALL, HE HAS 40 COINS. HOW MANY COINS OF EACH KIND DOES HE HAVE? what is the simplest form of (x^-2y^-3)over (x^2y^-1)^3