यदि a + b + c = 0, |a| = 3, |b| = 4, |c| = 5 तो a . b + b . c + c . a =

Question

यदि \(\vec {a} + \vec {b} + \vec {c} = 0 , \vec{|a|} =3 , \vec{|b|} = 4, \vec {|c|} = 5 \) तो \(\vec {a} . \vec {b} + \vec {b} .\vec {c} + \vec {c}. \vec {a} =\)

(a) -5

(b) 47

(c) 0

(d) 25

Answer 1

सही विकल्प है (d) 25