Prove that a number in the form 6k+5,” what I mean is a number in the form of 6 times some integer plus 5. So to consider two arbitrary numbers of that form, you would need to use different symbols for each integer such as 6a+5 and 6b+5, or with subscripts: . Then show that the product of those two numbers can be expressed in the form 6m+1 where m is an integer.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Prove that a number in the form 6k+5,” what I mean is a number in the form of 6 times some integer plus 5. So to consider two arbitrary numbers of that form, you would need to use different symbols for each integer such as 6a+5 and 6b+5, or with subscripts: . Then show that the product of those two numbers can be expressed in the form 6m+1 where m is an integer.

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