Please help me out with question (f). Thanks

a b c=a.b×c=i^-2j^+3k^.2i^-3j^+k^×3i^+j^-2k^

=i^-2j^+3k^.2k^+4j^+9k^+6i^+3j^-i^=i^-2j^+3k^.5i^+7j^+11k^

=5-14+33=24

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