= 4! × 5!!
= ( 4 × 3 × 2 × 1 ) × 5!!
= ( 12 × 2 × 1 ) × 5!!
= ( 24 × 1 ) × 5!!
= 24 × 5!!
= 24 × ( 5 × 3 × 1 )
= 24 × ( 15 × 1 )
= 24 × 15
= 360
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Penyelesaian :
= 4! × 5!!
= ( 4 × 3 × 2 × 1 ) × 5!!
= ( 12 × 2 × 1 ) × 5!!
= ( 24 × 1 ) × 5!!
= 24 × 5!!
= 24 × ( 5 × 3 × 1 )
= 24 × ( 15 × 1 )
= 24 × 15
= 360