Question 9
The ‘4’ button on my calculator is defective, so I cannot enter numbers which contain the digit 4, thus, I cannot enter the calculation $2\times14$ and do not attempt to do so. Moreover, my calculator also does not display the digit 4 if 4 is part of an answer, so for example, the result of multiplying 3 by 18 is displayed as 5 instead of 54 and the result of multiplying 2 by 71 is displayed as 12 instead of 142. If I multiply a positive one-digit number by a positive two-digit number on my calculator and it displays 26, list all such pairs of numbers which I could have multiplied?