if I play 1 unit all 37 numbers 30 times then play all 37 numbers with 3 units for 20 times and when a number hit I put it back to 1 unit for 30 times

Your strategy involves a sequence of bets where you place different amounts on all 37 numbers over several rounds. Here's a breakdown of the approach:

### Strategy Overview
1. **First Phase**: Bet 1 unit on all 37 numbers for 30 rounds.
2. **Second Phase**: Bet 3 units on all 37 numbers for 20 rounds.
3. **Third Phase**: When a number hits during the second phase, you revert to betting 1 unit on that number for the next 30 rounds.

### Analyzing the Outcome
#### Phase 1: Bet 1 Unit on All 37 Numbers for 30 Rounds
- **Total Bet Per Round**: 37 units (since you're betting on all numbers).
- **Total Bet for 30 Rounds**: \(37 \times 30 = 1,110\) units.
- **Winnings Per Hit**: Each winning bet pays 36 units (since you're betting 1 unit and the payout is 36 times the bet).
- **Expected Number of Hits**: Since you’re covering all 37 numbers, you will have a hit every single round.

- **Total Winnings in Phase 1**: \(36 \times 30 = 1,080\) units.
- **Net Loss for Phase 1**: \(1,110 - 1,080 = 30\) units.

#### Phase 2: Bet 3 Units on All 37 Numbers for 20 Rounds
- **Total Bet Per Round**: \(37 \times 3 = 111\) units.
- **Total Bet for 20 Rounds**: \(111 \times 20 = 2,220\) units.
- **Winnings Per Hit**: \(36 \times 3 = 108\) units.

- **Total Winnings in Phase 2**: \(108 \times 20 = 2,160\) units.
- **Net Loss for Phase 2**: \(2,220 - 2,160 = 60\) units.

#### Phase 3: Reverting to 1 Unit for 30 Rounds After a Hit
- **Total Bet Per Round**: 37 units.
- **Total Bet for 30 Rounds**: \(37 \times 30 = 1,110\) units.
- **Winnings Per Hit**: 36 units per hit.

- **Total Winnings in Phase 3**: \(36 \times 30 = 1,080\) units.
- **Net Loss for Phase 3**: \(1,110 - 1,080 = 30\) units.

### Cumulative Analysis
- **Total Units Bet**: \(1,110 + 2,220 + 1,110 = 4,440\) units.
- **Total Winnings**: \(1,080 + 2,160 + 1,080 = 4,320\) units.
- **Net Loss Over All Phases**: \(4,440 - 4,320 = 120\) units.

### Conclusion
Your strategy still results in a net loss of 120 units over the entire sequence of bets. This loss occurs because of the house edge and the fact that each winning bet returns only 36 times your wager, not enough to cover the total amount bet across all numbers (37 units).

#### Key Points:
- The house edge remains consistent, leading to an inevitable long-term loss.
- Although betting on all numbers ensures a win every round, the payout structure guarantees a small loss each time.
- Modifying your bet sizes does not overcome the mathematical disadvantage built into the game.

Would you like more details on any aspect or further questions? Here are some related questions:

1. How does the house edge impact long-term outcomes in gambling strategies?
2. What is the expected value calculation for complex betting strategies?
3. Can a combination of different betting strategies ever yield a long-term profit?
4. How do professional gamblers approach games with a house edge?
5. What are some alternative strategies for minimizing losses in gambling?
6. How does variance affect the outcomes in gambling over many rounds?
7. What are some real-life examples of betting systems used in casinos?
8. Why does increasing the bet size not necessarily increase the chance of winning?

**Tip**: In gambling, it's crucial to understand that altering bet sizes or patterns doesn't change the inherent odds of the game, which are designed to favor the house.

Understand a complex gambling strategy involving betting on all 37 numbers multiple times with varying units. Learn about the expected outcomes, net losses, and the impact of the house edge. Suitable for advanced learners and those interested in probability and gambling strategies.

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