Let a = i +5 j + k , b = i +3 j + k and c =- i +2 j -3 k be three vectors such that, | b c |=5 3 and a is...

Question

Let a = i +5 j + k , b = i +3 j + k and c =- i +2 j -3 k be three vectors such that, | b c |=5 3 and a is perpendicular to b . Then the greatest amongst the values of | a | is ——

Accepted Answer

90

JEE Main 2021 Mathematics question

Solution