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    				| 1. | Common prime factors of 30 and 250 are(a) 2 x 5(b) 3 x 5(c) 2 x 3 x 5(d) 5 x 5 | 
| Answer» (a) 2 x 5 Prime factors of 30 are 2 x 3 x 5 Prime factors of 250 are 5 x 5 x 5 x 2 ∴ Common prime factors are 2 x 5. | |