A + B means A is greater than B. A `+-` B means A is greater than or equal to B.
A = B means A is equal to B.
A @ B means A is smaller than B.
A `underline"@"` B means A is smaller than or equal to B.
Statements: M + N, M + P, O = N
Conclusions: I. N + M II. O @ M

Options

A. If only I is true
B. if only conclusion II is true
C. if either conclusion I or II is true
D. if either I nor II is true

Answer

D

Explanation

Statements: `M gt N, M gt P, O = N`
Conclusions: I. `N gt M` II. `O lt M`
I is wrong as it is opposite of `M gt N`. II does not follow from anything. Quick method: I is wrong because N is not greater than anything in the given statements, so Tip 8(ii) applies. II is wrong because O is not less than anything in the given statements, so Tip 8(i) applies.