JEE Main 20203 Sep, Evening shiftMathematicsMediumMatrices and Determinants245× since 2002
Let S be the set of all integer solutions, (x, y, z),
of the system of equations
x – 2y + 5z = 0
–2x + 4y + z = 0
–7x + 14y + 9z = 0
such that 15 x²
+ y²
+ z² 150. Then, the
number of elements in the set S is equal to
______ .