7tennis balls are identical in every way, except that one of them weighs slightly less than the other 6. how can you identify the lightweight ball with no more than two separate weighings using a balance scale?

this is a brainteaser.

step-by-step explanation:

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.