Problem: what is the remainder when 1250 * 1090 * 1045 * 1055 is divided by 18 ?
Rationale: "oa is ' c ' . oe : take the remainder from each of 1250 / 18 , 1090 / 18 and so on . . 1250 / 18 gives remainder = 8 1090 / 18 gives remainder = 10 1045 / 18 gives remainder = 1 1055 / 18 gives remainder = 11 the net remainder is the product of above individual remainders . i . e = 8 * 10 * 1 * 11 break them into pairs 8 * 10 / 18 gives remainder 8 and 1 * 11 / 18 gives remainder 11 so 8 * 11 / 18 gives remainder 16 . answer : c"
annotated_formula: reminder(multiply(1090, 1250), 1045)