exam Maths Puzzle Numerical Ability

L = {x I x is a letter in the keyword lovely}

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Hi all see this 2 Questions plz
1- A die was rolled 720 times , what is the probability that the number 4 will be exactly 125 times ?

2- What is the probability of getting at most three heads in 8 flips of balanced coin ?
How do I graph the following rational function:
f(x)= 1/x^2+4

Thank you for your help.