A three digit number is taken. the digits are reversed & the difference between the two numbers is written . Which of the foll. cannot be that difference?

a)99
b)495
c)693
d)173
plz respond soon & show how did u cracked the ques

let us take a three digit no xyz 

when digits are reversed no become zxy

nw according to question

xyz - zxy = 100x + 10y + z -(100z + 10x + y) {i have split the no into unit tns and hundred}

so  

90x - 9y - 99z = 9(10x - y - 11z)

this shows that difference is the multiple of 9

so by this d is correct answer bcz it is not multiple of 9

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