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9! = 5! + 4!
9x8x7x6x5x...x1 = 5x4x3x2x1 + 4x3x2x1
(SALAH)
2. (5x4)! = 5! x 4!
20! = 5! x 4!
20x19x18x...x1 = 5x4x3x2x1 x 4x3x2x1
(SALAH)
a. 7!
b. 6! / 3!
Nilai dari 5! + 4! = 120 + 24 = 144.
Kesimpulan: (5 + 4)! ≠ 5! + 4!
2.) Tentukan dari ruas kiri, (5x4)! = 20! = 2.432902e¹⁸.
Nilai dari 5!*4! = 120*24 = 2880.
Kesimpulan: (5x4)! ≠ 5!*4!.
a.) 1*2*3*4*5*6*7 = 7!
b.) 6*5*4 =