book Maths Puzzle Numerical Ability

(x2+1/x2)(x+1)

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book Other Question

In a certain country, there is a bank failure once every six days, on average. What is the probability of at least one bank failure in the next 30 days?

Is this set up 1 less 1/6?
If f(x) = x2 + 5, find f(a + h) − f(a)