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Mathematics for IGCSE & O level - Number (Section 3 - No. 38)

Which set of numbers contains only natural numbers?
{-1, 0, 1, 2}
{0, 1, 2, 3}
{1, 2, 3, 4}
{-2, -1, 0, 1}

Explanation

Natural numbers are positive integers starting from 1.

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