Write or illustrate the number in the indicated form.1421; Express in expanded form.
A. 1 ? 103 + 4 ? 102 + 2 ? 101 + 1 ? 100
B. 1 ? 101 + 4 ? 102 + 2 ? 103 + 1 ? 104
C. 1 ? 100 + 4 ? 101 + 2 ? 102 + 1 ? 103
D. 1 ? 104 + 4 ? 103 + 2 ? 102 + 1 ? 101
Answer: A
Mathematics
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