Study the pattern carefully and select the number that can replace the question mark (?)

- AOption (a)
33
- BOption (b)
32
- COption (c)
31
- DOption (d)
30
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Correct answer
31
Why this answer is correct
The logic followed here is:
→ (21 - 6) × (21 + 6) = 15 × 27 ⇒ 405
And,
→ (23 - 5) × (23 + 5) = 18 × 28 ⇒ 504
Similarly,
→ (? - 9) × (? + 9) = 880
→ (?)2 - (9)2 = 880
→ (?)2 = 880 + 81
→ ? = √961
→ ? = 31
Hence, "Option 3" is the correct answer.









