Mathematics

This problem is about applying a custom operation twice in sequence. The key insight is to treat the operation like any function: compute the inner operation first to get a single number, then use that result as the first input to the outer operation. Don't let the unfamiliar symbol $\otimes$ intimidate you—just substitute carefully into the definition each time.

This problem is about applying a custom operation twice in sequence. The key insight is to treat the operation like any function: compute the inner operation first to get a single number, then use that result as the first input to the outer operation. Don't let the unfamiliar symbol $\otimes$ intimidate you—just substitute carefully into the definition each time.