If the projection of the vector i +2 j + k on the sum of the two vectors 2 i +4 j -5 k and - i +2 j +3 k is...

Question

If the projection of the vector i +2 j + k on the sum of the two vectors 2 i +4 j -5 k and - i +2 j +3 k is 1, then is equal to________.

Accepted Answer

5

JEE Main 2021 Mathematics question