ab is a 2 digit number. what is the remainder when ab-ba is divided by 9?
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Answer:
Step-by-step explanation:
A=7x+3
B=7y+5
A-B=7(x-y)-2
A-B=7(x-y)-7+7–2 [by adding -7 and +7]
A-B=7(x-y-1)+5
As seen above, if we divide A-B by 7, the remainder will be 5.
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