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I use the ^ symbol to mean 'to the power of' and * to mean multiply. You want to find i^21

Remember i^4 = i^2 * i^2 = -1 * -1 = 1

So i^21 = i^4 * i^4 * i^4 * i^4 * i^4 * i^1 = 1 * 1 * 1 * 1 * 1 * i = i.

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9y ago

What else can I help you with?