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Permutations and Combination — Maths STD 11 Science — Question

Maharashtra BoardEnglish MediumSTD 11 ScienceMathsPermutations and Combination1 Mark
Question
Write in terms of factorials
$5 \times 10 \times 15 \times 20$
✓

Answer

$5 \times 10 \times 15 \times 20$
$=(5 \times 1) \times(5 \times 2) \times(5 \times 3) \times(5 \times 4)$
$=\left(5^4\right)(4 \times 3 \times 2 \times 1)$
$=\left(5^4\right)(4 !)$

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