Question

Which of the following numbers will INCREASE the MOST on interchanging their digits at the one’s and the ten’s place?
a) 12345
b) 24315
c) 54312
d) 55555

Answer 1

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What you have to do in this question is: you have to find the digits at tens place and thousands place and exchange their position. 

In 5384, 

unit digit = 4

tens digit = 8

hundreds digit = 3

thousands digit = 5

If we exchange tens and thousands digit, then 

unit digit = 4

tens digit = 5

hundreds digit = 3

thousands digit = 8

So new number will be 8354

Answer 2

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