76

if the no. is a multiple of 3 (and  not 4 or 6) it would cum in da 1st range as well as da 2nd n 3rd. this tautology is removed by a number tht is a multiple of 4 or 6. as a multiple of 6 would also a multiple of 3 the no. would b a multiple of four cumin in da 3rd range. as there r two options 72 or 76, v c tht 72 is a multiple of 3&6 hence, it isnt da desired no. this can also b explained by union of sets.