Testing PDF

https://1drv.ms/b/s!AsfoM0DyqhkcgZw0Gp8GM14e-Ld_gghttps://1drv.ms/b/s!AsfoM0DyqhkcgZw0Gp8GM14e-Ld_gg

Solution to a question on vectors in JEE MAIN 2015.

Thanks
Lok

Solution

 

Permutations

Solution

 

Question of the day

 

To solve this question, we observe that,

So we can write,

The given equation can now be written as:

Now let's put

The equation then becomes

or

Solving this we get,

But,

Therefore,

or