The least number which should be added to 497 so that the sum is exactly divisible by 5, 6, 4 and 3 is:

3

23

43

33

L.C.M. of 5, 6, 4 and 3 = 60. On dividing 497 by 60, the remainder is 17. Number to be added = (60 – 17) = 43

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