book Maths Puzzle Numerical Ability

Hi Could you please help me to solve this problem:

Find a probability if a die is rolled 5 times: P(exactly one 5)

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book Other Question

Why do you divide the sequence in the 2nd difference of a quadratic equation before adding it to your formula? the lenght of a picture frame is 3 in. greater than the width. the perimeter is less than 52 in.Describe the dimensions of the frame.

please help me out and thank you....