(?H ? K) • (H ? ?T) $\frac{\mathrm{H} \vee \sim \mathrm{H}}{\sim \mathrm{T} \vee \mathrm{K}}$
A) Invalid.
B) CD-valid.
C) DD-valid.
D) DA-invalid.
E) MP-valid.

Name: (?H ? K) • (H ? ?T) $\frac{\mathrm{H} \vee \sim \mathrm{H}}{\sim \mathrm{T} \vee \mathrm{K}}$ A) Invalid. B) CD-valid. C) DD-valid. D) DA-invalid. E) MP-valid.
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The Answer of (?H ? K) • (H ? ?T) $\frac{\mathrm{H} \vee \sim \mathrm{H}}{\sim \mathrm{T} \vee \mathrm{K}}$
A) Invalid.
B) CD-valid.
C) DD-valid.
D) DA-invalid.
E) MP-valid.

(?H ? K) • (H ? ?T) H∨∼H∼T∨K\frac{\mathrm{H} \vee \sim \mathrm{H}}{\sim \mathrm{T} \vee \mathrm{K}}∼T∨KH∨∼H​

(?H ? K) • (H ? ?T) $\frac{\mathrm{H} \vee \sim \mathrm{H}}{\sim \mathrm{T} \vee \mathrm{K}}$