If `2a+3b+c=0, " then " axx b +b xx c+c xx a` is equal to

If a+2b+3c=0, then a xx b+b xx c+c xx a is equal to

If a + 2b - c = 0 and a xx b + b xx c + c xx a = lambda (a xx b) , then the value of lambda is equal to a)5 b)4 c)2 d)-2

A : If a,b,c are vectors such that [a b c] = 4 then [a xx b b xx c c xx a] = 64 R : [a xx b b xx c c xx a] = [a b c]^(2)