4 , 6 , 12 , 14 , 28 , 30 , . . ?
"c 60 the given sequence is a combination of two series 4 , 12 , 28 , . . . . and 6 , 14 , 30 , . . . . the pattern is + 8 , + 16 , + 32 . so , the missing number = ( 28 + 32 ) = 60"
subtract(negate(14), multiply(subtract(6, 12), divide(subtract(6, 12), subtract(4, 6))))