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प्रश्न
Write five pairs of prime numbers less than 20 whose sum is divisible by 5. (Hint : 3 + 7 = 10)
योग
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उत्तर
- 2 + 3 = 5
- 2 + 13 = 15
- 3 + 17 = 20
- 7 + 13 = 20
- 5 + 5 = 10
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