Dipanjan pointed out a mistake in the explanation of exponentiation. The test says:
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For the previous example, the binary representation of 6 is 110 so the second and third powers of 2 are included: 2^2 and 2^4.
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This should say:
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For the previous example, the binary representation of 6 is 110 so the second and third powers of 2 are included: 2^1 = 2 and 2^2 = 4.
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(Here I've used ^ to mean exponentiation because the forum doesn't seem to be able to display exponents easily.)
Thanks again Dipanjan!
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Correction on page 36