Statement: All brick are stones. Some stones are rocks. All rocks are mountains. Conclusions: I. Some mountains are stones. II. Some mountains are bricks. III. Some stones are bricks.

Some stones are rocks + All rocks are mountains = I + A = I = Some stones are mountains → conversion → Some mountains are stones (I). Hence II follows. All brick are stones + Some stones are mountains = A + I = No conclusion Hence II does not follow. All brick are stones (A) → conversion → Some stone are bricks(I). Hence III follows.