A problem by Vishal S

Level pending

x&y are digits such that xy+9=yx then number of possibility of (x,y)


The answer is 8.

Vishal S by Vishal S , 21, India

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1 solution

Parveen Soni
Nov 21, 2014

answer should be 9. Why (0,1) pair is not counted?
my solution:- xy can be written as 10x+y so yx =10y+x hence
10x+y+9=10y+x ----> x+1=y. So x can be 0 to 8. So total 9 pairs.

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(0,1) we cannot write because 01 =1

Vishal S - 6 years, 6 months ago

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you mentioned x and y as digit not numbers and there is nothing written that xy can't be 1 and about xy and yx.
And as per Question statement we can write
01+9=10 which is true where x=0 and y=1

Parveen Soni - 6 years, 6 months ago

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OK SORRY I'LL CHANGE THE PROBLEM

Vishal S - 6 years, 6 months ago

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@Vishal S – that will be great. thanks

Parveen Soni - 6 years, 6 months ago

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