Question 18
Back to Exercise
Study the pattern.
| Number | Square root |
|---|---|
| 1 | 1 |
| 121 | 11 |
| 12321 | 111 |
| 1234321 | 1111 |
| 123454321 | ? |
What is √123454321?
- A 111111
- B 12345
- C 11111 Correct
- D 1111
Correct Answer: Option C
The number rises to 5 and falls back → five 1s in the root
√123454321 = 11111
Check: 11111² = 123454321 ✓
Trap: 12345 copies the rising digits.
Answer: 11111
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