Question

If position vector of a point Pis r = xi+yj+zî, where x, y, z € N and
10
projection of 7 on a=i+j+k is then number of possible position
13
of P is also equal to
a) number of natural solution of the equation x+y+:=7.
b) number of ways of selecting two objects out of 10 objects arranged
in a row so that no two of them are next to each other.
c) The total number of outcomes when a pair of dice are rolled once.
d) number of divisors of 1800.​

Answer 1

The total number of outcomes when a pair of dice are rolled once.