book Maths Puzzle Numerical Ability

What is the number of arrangements that can be made out of the letters of the words "SUCCESS" so that all the S do not come together?

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book Other Question

Given f(x) = 5x + 1, find f(a + 2) s=16t^2

an acorn falls from the top of an oak tree and takes 2 sec. to hit the ground. How high is the tree?