Some expressions are worked out on the basis of a certain rule. On the same basis, find the missing number.
If 11 × 12 × 13 = 234 and 24 × 23 × 35 = 658, then 31 × 43 × 54 = ?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 479
Here ‘×’ is not ordinary multiplication. Find the rule from the solved examples: the sum of the digits of each number is written in the same order.
11, 12, 13: digit sums 2, 3, 4, written together 234
24, 23, 35: digit sums 6, 5, 8, written together 658
31: \(3+1=4\)
43: \(4+3=7\)
54: \(5+4=9\)
Written together: 479