20!!
= (20 × 18 × 16 × 14 × 12 × 10 × 8 × 6 × 4 × 2)
= (360 × 16 × 14 × 12 × 10 × 8 × 6 × 4 × 2)
= (5.760 × 14 × 12 × 10 × 8 × 6 × 4 × 2)
= (80.640 × 12 × 10 × 8 × 6 × 4 × 2)
= (967.680 × 10 × 8 × 6 × 4 × 2)
= (9.676.800 × 8 × 6 × 4 × 2)
= (77.414.400 × 6 × 4 × 2)
= (464.486.400 × 4 × 2)
= (1.857.945.600 × 2)
= 3.715.891.200
____________________________________
5!
= (5 × 4 × 3 × 2 × 1)
= (20 × 3 × 2 × 1)
= (60 × 2 × 1)
= (120 × 1)
= 120
10^2
= (10 × 10)
= 100
20 × 18 × 16 × 14 × 12 × 10 × 8 × 6 × 4 × 2
360 × 224 × 120 × 48 × 8
80.640 × 5.760 × 8
80.640 × 46.080
3.715.891.200
-----------
5 × 4 × 3 × 2 × 1
20 × 6
120
------------
10²
10 × 10
(1 × 1)00
100
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Penyelesaian :
20!!
= (20 × 18 × 16 × 14 × 12 × 10 × 8 × 6 × 4 × 2)
= (360 × 16 × 14 × 12 × 10 × 8 × 6 × 4 × 2)
= (5.760 × 14 × 12 × 10 × 8 × 6 × 4 × 2)
= (80.640 × 12 × 10 × 8 × 6 × 4 × 2)
= (967.680 × 10 × 8 × 6 × 4 × 2)
= (9.676.800 × 8 × 6 × 4 × 2)
= (77.414.400 × 6 × 4 × 2)
= (464.486.400 × 4 × 2)
= (1.857.945.600 × 2)
= 3.715.891.200
____________________________________
5!
= (5 × 4 × 3 × 2 × 1)
= (20 × 3 × 2 × 1)
= (60 × 2 × 1)
= (120 × 1)
= 120
____________________________________
10^2
= (10 × 10)
= 100
20!!
20 × 18 × 16 × 14 × 12 × 10 × 8 × 6 × 4 × 2
360 × 224 × 120 × 48 × 8
80.640 × 5.760 × 8
80.640 × 46.080
3.715.891.200
-----------
5!
5 × 4 × 3 × 2 × 1
20 × 6
120
------------
10²
10 × 10
(1 × 1)00
100