show that 9n+1 -8n-9 is divisible by 64 whenever n is a postive integer
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9n+1-8n-9
=9n-8n+1-9
=n-8
n be a postive number because if it is negative then it is not divisible by 64 eg.
-54-8/8= -1
so n be a postive integer
=9n-8n+1-9
=n-8
n be a postive number because if it is negative then it is not divisible by 64 eg.
-54-8/8= -1
so n be a postive integer
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