- (A) 81
- (B) 41
- (C) 31
- (D) 61
_______ is considered the largest glacier of Pakistan.
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- (A) Siachen Glacier
- (B) Tirich Mir Glacier
- (C) Biafo Glacier
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Find the odd one out in the given series: 31, 41, 53, 61, 71, 81
Find the odd one out in the given series: 31, 41, 53, 61, 71, 81
- Solution: Here’s the analysis for the sequence: 31, 41, 53, 61, 71, 81
- What makes a number stand out: we check for primality, as all the numbers are prime.
- 31: Prime number (divisible only by 1 and the number itself)
- 41: Prime number
- 53: Prime number
- 61: Prime number
- 71: Prime number
- 81: Composite number (9 × 9 or 3 × 27)
- All the numbers are prime except for 81.
- Correct answer: 81
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