exam Maths Puzzle Numerical Ability

Jasmine says that there are 362,880 distinguishable permutations of the letters in the word TEXTBOOKS. Do you agree? Justify your answer.

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exam Other Question
Need help with this problem and how to solve:
(X + 6)(-2)

I think the answer is -2x + 12

please help me How do you simplify a^6b^-5/a^-2b^7?