MCQ
$a\,.\,[(b + c) \times (a + b + c)]$=
- A$[a b c]$
- B$2[a b c]$
- C$3[a b c]$
- ✓$0$
$ = a\,.\,(b \times a + b \times b + b \times c) + a\,.\,(c \times a + c \times b + c \times c)$
$ = [a\,b\,a] + [a\,b\,b] + [a{\rm{ }}b{\rm{ }}c] + [a\,c\,a] + [a{\rm{ }}c{\rm{ }}b] + [a{\rm{ }}c{\rm{ }}c]$
$=0 + 0 + [a\,b\,c] + 0 - [a\,b\,c] + 0 = 0.$
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