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If a = 21 +1 -k, b = -T + 27 – 4k, c =1+1+ k then find (a xb). (b × c
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1. Answer:

   [tex]a \times b \\ a = 21 + 1 – k\\ b = – t + 27 \\ c = 1 + 1 + k \\ a \times b = 22 -k \times – t + 27 \\ a \times b = 594 – k – t\\ b \times c = – t + 27 \times 2 + k \\ b \times c = – t + 54 + k[/tex]

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