MTH103 TMA1 Questions and Solutions : If a=5i+4j+2k, b=4i-5j+3k and c=2i-j-2k. Determine value \[a\dot b\]

If a=5i+4j+2k, b=4i-5j+3k and c=2i-j-2k. Determine value \[a\dot b\]
a) 10i-4j-4k
b) 10i+4j+4k
c) 8i-2j-4k
d) 10i+4j+4k
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