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2021 AMC Fall 10A Problem 5

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2021 AMC Fall 10A Problem 5AMC 10 Step by Step
Name:                             Date: September 13, 2026
Primes · difficulty 2 of 5 · about 2 min · position P1-10

The six-digit number 2‾ 0‾ 2‾ 1‾ 0‾ A‾\underline{2}\,\underline{0}\,\underline{2}\,\underline{1}\,\underline{0}\,\underline{A} is prime for only one digit A.A. What is A?A?

  1. A)

    11

  2. B)

    33

  3. C)

    55

  4. D)

    77

  5. E)

    99

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