exam Maths Puzzle Numerical Ability

How many distinguishable permutations of letters are possible in the word BASEBALL?
The answer is supposed to be 5040.

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exam Other Question

PLease help to simplify

-3i^4 + 5i^3

DIVIDED BY

6i^2 - 7i
If f(x) = 5x -1, find the following:

f(a-2)

Thank you.