Consider the letters A-F. How many different arrangements are there for which: A is before B and C is before D? A and B are next to each other and C and D are also next to each other? E is not last in the line?

Q: 1,322 471

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Q: A т D n 6 5 10 12

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Q: 1 4. Given A=) 2 2 1 a. A + 2B b. 3A-2B and B = -3 4 -2 2 find

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Q: A.B? B.A?

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Q: 1 -1 2 2 1 -1 A = 2 B = 1 3 2 4 C = 1 -1 4 -4 Find A - B, A+ B, and A + C.

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Q: Find BA. A = BA= -1 - 1 -6-2 B = -2 - 3 -4 -1

A: Given:     A = -1-1   -6-2    B = -2-3  -4-1

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Set Theory

Every field in the present world involves a set. The theory of sets was developed by German mathematician Georg Cantor while working on the “problems of trigonometric series”.