2. Let A = 1 21 . Consider the following elementary matrices, E = (1 0 0 -7 (1 ) and E3 = ( 6 1 ), E = ( ). Which one of the following is true? A) A = E1 E3 E, E4 B) A = E1 E2 E3 C) A = E3EE2 D) A = E2E E E) None of the above.

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J . 15. Among the matrices A= 0 0 0 1 0 0 1 0 0100 | 1 0 0 0 B= /0 0 1 0 1 0 100) 1 -1 0 ,C=1 0 1 3 0 0 0 1 ) / 0 1 0 /1 0 0 | 1 1 0 D= 200, E= 10-20, F01 0. 100 1 ) 0 0 1 0 0 1 A) A, B, C, E and F are elementary, the others are not; B) B, E and F are elementary, the others are not; C) A, B, E and F are elementary, the others are not; D) none of these matrices is elementary, E) they are all elementary.

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2. Let A = 1 21 . Consider the following elementary matrices, E = (1 0 0 -7 (1 ) and E3 = ( 6 1 ), E = ( ). Which one of the following is true? A) A = E1 E3 E, E4 B) A = E1 E2 E3 C) A = E3EE2 D) A = E2E E E) None of the above.

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