Identify the incorrect number in the following series:

$$18225, 6075, 2025, 675, 220, 75, 25$$

Question

Identify the incorrect number in the following series:

$$18225, 6075, 2025, 675, 220, 75, 25$$

Accepted Answer

**Solution:**

1. Observe the series: $$18225, 6075, 2025, 675, 220, 75, 25$$

2. Check the pattern by dividing each term by 3:
   - $$\frac{18225}{3} = 6075$$
   - $$\frac{6075}{3} = 2025$$
   - $$\frac{2025}{3} = 675$$
   - $$\frac{675}{3} = 225$$ (not 220)

3. The next term should be $$225$$ instead of $$220$$.

4. Continuing the pattern:
   - $$\frac{225}{3} = 75$$
   - $$\frac{75}{3} = 25$$

5. Hence, the incorrect number in the series is **220**.

**Answer:** $220$

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