If | a|=3, | b|=5 and | c|=7 and a+ b+ c= 0, then the angle between a and b is

MHT CET 2022 Mathematics question

If and and , then the angle between and is

Answer: (C)

From , square both sides: , so and . Then , so

Create a free account to read the complete working, and practise questions like this in a timed test.

Question ID VK-093594