For three unit vectors a , b , c satisfying | a - b |^2+| b - c |^2+| c - a |^2 = 9 and |2 a +k b +k c | = 3,...

Question

For three unit vectors a , b , c satisfying | a - b |^2+| b - c |^2+| c - a |^2 = 9 and |2 a +k b +k c | = 3, the positive value of k is :

Accepted Answer

(4)

JEE Main 2026 Mathematics question