How do you write 1×3+7×3 as the product of two factors?

Question

Find a way to write the digits 1 through 9 in sequence, so that the numbers determined by any two consecutive digits are divisible either by 7 or by 13.

Answer 1

8x3 or 12x2 or 6x4

1×3+7×3
=3+21
=24

Now
24=8x3 or 12x2 or 6x4

Answer 2

Applying BODMAS rule, we have to first multiply 7 x 3 =21. Then 3 x 1 = 3. Now both these products should be added and the answer is 24. M.J. SUBRAMANYAM