Show that 9^(n+1) - 8n - 9 is divisible ...

Show that `9^(n+1)` - 8n - 9 is divisible by 64, whenever n is a positive interger.

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The correct Answer is:

`= 64 [.^((n+1))C_(2)+.^((n+1))C_(3).(8)+...+.^((n+1))C_((n+1))(8)^(n-1)]`

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