Ci) Use the method of Mathematical Induction to show that for all positive integer values n21, (1+x)" -1 is divisible by x, where x is any positive integer. (ii) Hence explain briefly how you know that 4" -1 is divisible by 3. ii) Hence deduce that 20"-5" - 4" +1 is divisible by 12 for all positive integers n21.

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