Question 881255
Basic idea


Step 1) Assume D is true


Step 2) If D is true, then D⊃ (B & ~Q) is true (Modus Ponens, Premise 1)


Step 3) if D⊃ (B & ~Q) is true, and D is true, then B & ~Q is true (Modus Ponens again)


Step 4) B & ~Q is the same as ~Q & B (commutation)


Step 5) If ~Q & B is true, then C is true (Modus Ponens, Premise 2)


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So assuming D is true leads to C being true. That leads to the conclusion D⊃ C