Where should parentheses be added to make the following expression true? 2 * 1 + 1 + 3 * 1 + 1 + 1 = 11

2 * (1 + 1) + 3 * 1 + 1 + 1

2 * 1 + (1 + 3) * (1 + 1 + 1)

2 * 1 + (1 + 3) * 1 + 1 + 1

2 * (1 + 1) + 3 * (1 + 1) + 1

Answer:
2 * (1 + 1) + 3 * (1 + 1) + 1

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