exam Maths Puzzle Numerical Ability

A toy is assembled from 3 parts.If the probability that each part is defected is 0.1.Calculate the probability that the toy is defective.

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Hi,
Can you help me with this math problem?

Use the theorem on bounds to establish the best integral bounds for the roots of the equation.
6x^3-7x^2+7x+9=0

the ans
Subtract, using the vertical method.

7x squared + 6x from 9x squared - 3