Discrete math question Can not figure out which one is wrong

Discrete math question. Can not figure out which one is wrong.

Let the universe of discourse contain all integers. Determine if the following statements are true: 3n(n^2 Greaterthanorequalto 6n) A. No, n = 2 does not satisfy the statement. B. Yes, n = 7 satisfies the statement. C. No, no values of n satisfy the statement. D. Yes, all values of n satisfy the statement. 3d(d^2 -4 = (d - 2)(d + 2)) A. No, no values of d satisfy the statement. B. Yes, d = 1/2 satisfies the statement. C. No, d = 2 does not satisfy the statement. D. Yes, d = 1 satisfies the statement. d(d^2 + 4d + 4 = 0) A. Yes, d = 2 satisfies the statement. B. Yes, all values of d satisfy the statement. C. No, no values of d satisfy the statement. D. No, d = 1 does not satisfy the statement. 3d(d^2 - 4d + 4 = 0) A. Yes, d = 2 satisfies the statement. B. Yes, all values of d satisfy the statement. C. No, only some values of d satisfy the statement. D. No, no values of d satisfy the statement. n(n^2 Greaterthanorequalto 6n) A. No, n = 2 does not satisfy the statement. B. Yes, all values of n satisfy the statement. C. Yes, n = 2 satisfies the statement. D. No, no values of n satisfy the statement. n(n^2 lessthanorequalto n) A. Yes, n = 2 satisfies the statement. B. No, no values of n satisfy the statement. C. Yes, all values of n satisfy the statement. D. No, n = 2 does not satisfy the statement.

Solution

3.c) False,because when d=-2 satisfy the statement.

5.d)False,because when n=7 satisfy the statement..

6.b)False.because when when n=0,1 satisfy the statement...