Question

26. ab is a two-digit number. If its digits are interchanged, then the different
between the new number and the original number is
(1) ab
(2) 9(a - b) (3) ba
(4) None of these​

Answer 1

Answer:

(2)9(a-b)

Step-by-step explanation:

let the number is 10a+b

if it interchanged 10b+a

hence the difference is 10a+b-10b-a

9a-9b=9(a-b)

Answer 2

Answer:

2) is the correct option

Step-by-step explanation:

let the number be 10

10a + b - 10b - b

= 9a -9b = 9( a-b)