4,7 , 11,18 , 29,47 , . . . ? . . , 123,199
"the addition of difference between each no . is equal to latter no . so , difference between 47 and 76 is 29 which is previous no . of 47 answer c"
subtract(negate(123,199), multiply(subtract(11,18, 29,47), divide(subtract(11,18, 29,47), subtract(4,7, 11,18))))