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4. Which of the following numbers i...
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4. Which of the following numbers is prime? (1) 247 (2)527 (3) 209 (4) 271
11th - 12th Class
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4. ( (4) 247=13 times 19 ) ( 527=17 times 31 Rightarrow 209=19 times 11 ) ( 271=1 times 271 ) Clearly, 271 is prime.
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