If S, J, and B stand for Smith’s, Jones’s, and Brown’s helmets, respectively, then the possible arrangements in which the helmets may be returned and the number of correct matches are
"\\def\\arraystretch{1.5}\n \\begin{array}{c:c}\n Sample\\ Space & m \\\\ \\hline\n SJB & 3 \\\\\n \\hdashline\n SBJ & 1 \\\\\n \\hdashline\n JSB & 1 \\\\\n \\hdashline\n BJS & 1 \\\\\n \\hdashline\n JBS & 0 \\\\\n \\hdashline\n BSJ & 0 \\\\\n\n\\end{array}"
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