Q278
The difference of a number consisting of two digits from the number formed by interchanging the digits is always divisible by :
A.
10
B.
9
AnswerC.
11
D.
6
Answer: Option B
Solution
Answer: Option B
Solution:
Let the number = 10x + yInterchange number = 10y + x
Difference
= 10x + y - 10y - x
= 9 (x - y)
The difference is always divisible by 9