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  1. What is the greatest number which divides 390, 480 and 620 so as to leave the same remainder in each case ?
    1. 15
    2. 10
    3. 20
    4. 19
Correct Option: B

The HCF of [(480 - 390), (620 - 480), (620 - 390)]
= HCF of 90, 140, 230 = 10


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