Tricky Question on Strengthened Conditional Proof

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This question teaches us how to think and assume appropriately for the desired result.
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Sir I am a final year student of MA.. quantification theory A class would be very helpful ...please sir give a class..on quantification theory 🙏🙏

meghnabiswas
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The justification for last step (23) must be written as 22 M.E.

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