0
20 = 2 × 10
→ The last digit MUST be a 0
→ The preceding digit must be even, ie one of {0, 2, 4, 6, 8}.
Wiki User
∙ 6y ago
Wiki User
∙ 6y agoIt is that the last digit of the number must be a 0 and the one before it must be even - belong to the set {0, 2, 4, 6, 8}.
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I
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