Others Maths Puzzle Numerical Ability

If you count 1 to 100 how many 4s

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Others Other Question

even if you remove 19-1 you need to get only 20 there is a cube which is painted with red blue and green on each pair of adjacent faces then this cube is divided into 512 identical cubelets. this is done by making cuts parallel to some surface of cube.So how many cubelets are painted on three faces ?