Using the table, what is the total production of all crops in the South region? 
1050 tons
- Step 1: Identify South's production. Wheat: 400, Rice: 350, Corn: 250.
- Step 2: Calculate total. Sum: $400 + 350 + 250 = 1000$ tons.
- Step 3: Verify with options. 1000 tons matches option (3).
- Step 4: Cross-check. Recalculate: $400 + 350 + 250 = 1000$.
- Step 5: Final conclusion. Option (3) 1000 tons is the correct answer.





For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: