2.prove that `a times(b times c)=(a times b)times c if a=1/3 , b=-2/3 and c=4/3`

Prove that (vec B timesvec c)*[vec A times(vec B timesvec C)]=0

Evaluate a^(7)times b^(7)times c^(-4)times c^(5)times d^(9)

If vec(a), vec(b) and vec(c) are three vectors such that vec(a) times vec(b)=vec(c) and vec(b) times vec(c)=vec(a)," prove that "vec(a), vec(b), vec(c) are mutually perpendicular and abs(vec(b))=1 and abs(vec(c))=abs(vec(a)) .

Prove that ( vec a- vec b)dot{( vec b- vec c)xx( vec c- vec a)}=0

Prove that: ( vec a- vec b)*{( vec b- vec c)xx(vec c- vec a)}"=0

Prove that [axxb, a xx c, d] = (a*d)[a, b, c]

A, B and C shot to hit a target. If A hits the target 4 times in 5 trails, B hit it 3 times in 4 trials and C hits 2 time in 3 trials; what is the probability that the target is hit by a least 2 person?

A, B and C shot to hit a target. If A hits the target 4 times in 5 trails, B hit it 3 times in 4 trials and C hits 2 time in 3 trials; what is the probability that the target is hit by a least 2 person?

Multiply: c. 5 (1)/(3) xx 2