Problem with two correct answers.

[cwgreene]

        id: '6.41',
        prompt: 'If D then M, and L',
        options: [
          { id: 0, label: '$ D \\rightarrow M \\cdot L $' },
          { id: 1, label: '$ (D \\rightarrow M) \\cdot L $' },
          { id: 2, label: '$ (D \\rightarrow (M \\cdot L)) $' },
          { id: 3, label: '$ ((D \\rightarrow M) \\cdot L) $' },
        ],
        correctId: [3],
        answer: '',

Answers 1 and 3 (2 and 4 in screenshot) are equivalent. Wrapping the statement with an additional parentheses doesn't affect the logical semantics.

logicola/contentOld.tsx

Lines 492 to 501 in 47cce3f

	id: '6.41',
	prompt: 'If D then M, and L',
	options: [
	{ id: 0, label: '$ D \\rightarrow M \\cdot L $' },
	{ id: 1, label: '$ (D \\rightarrow M) \\cdot L $' },
	{ id: 2, label: '$ (D \\rightarrow (M \\cdot L)) $' },
	{ id: 3, label: '$ ((D \\rightarrow M) \\cdot L) $' },
	],
	correctId: [3],
	answer: '',

[cwgreene]

[malikpiara]

Duplicate of #49