D = x E = x F = x The number 4 is D ∩ (E ∩ F).

1. True

2. False

Answer: 1. True

Step-by-step explanation:

Given : D = x = { 0, 1, 2, 3, 4, 5, ... }

E = x is a perfect square between 1 and 9 = {4 }

F = x is an even number greater than or equal to 2 and less than 9 = {4, 6, 8}

Since intersection of sets contains all the values they have common.

Then, E ∩ F = {4}

Now, D∩ (E ∩ F) = { 0, 1, 2, 3, 4, 5, ... } ∩ {4} = {4}

Hence, The number 4 is D ∩ (E ∩ F).

Thus, the given statement is 1. true.