Last
7!!
(dua kali itung) =✓
contoh :
2!!
= 2 × 1 × 2 × 1
= 4
(ya begitulah)
8! =
`⌁ ◜Soal◞
• 7!!
• 8!
`⌁ ◜Jwbn◞
• 7!!
= ( 7 × 6 × 5 × 4 × 3 × 2 × 1 ) × ( 7 × 6 × 5 × 4 × 3 × 2 × 1 )
= 5.040 × 5.040
= 25.401.600
• 8!
= 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
= 56 × 6 × 5 × 4 × 3 × 2 × 1
= 336 × 5 × 4 × 3 × 2 × 1
= 1.680 × 4 × 3 × 2 × 1
= 6.720 × 3 × 2 × 1
= 20.160 × 2 × 1
= (20.160 + 20.160) × 1
= 40.320 × 1
= 40.320