Why when we use apply on single column the code get error but when we use function apply on two column the code run smoothly

Why when we use apply on single column the code get error but when we use function apply on two column the code run smoothly
Certified Biostat Q&A list
MODULE#1 The Certified Biostatistician Diploma Meeting Minutes
LECTURES 5-8
Why when we use apply on single column the code get error but when we use function apply on two column the code run smoothly

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