……Soal :7! +8! -2! -2!​

~Faktorial~

• Ditanya :

7! + 8! – 2! – 2! = …

• Jawab :

> 7! + 8! – 2! – 2!

= (7 x 6 x 5 x 4 x 3 x 2 x 1) + (8 x 7 x 6 x 5 x 4 x 3 x 2 x 1) – (2 x 1) – (2 x 1)

___________________________________

7! = 7 x 6 x 5 x 4 x 3 x 2 x 1

7 x 6 = 42

42 x 5 = 210

210 x 4 = 840

840 x 3 = 2.520

2.520 x 2 = 5.040

5.040 x 1 = 5.040 ✔

8! = 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1

8 x 7 = 56

56 x 6 = 336

336 x 5 = 1.680

1.680 x 4 = 6.720

6.720 x 3 = 20.160

20.160 x 2 = 40.320

40.320 x 1 = 40.320 ✔

2! = 2 x 1

= 2 ✔

_________________________________

> 7! + 8! – 2! – 2!

= (7 x 6 x 5 x 4 x 3 x 2 x 1) + (8 x 7 x 6 x 5 x 4 x 3 x 2 x 1) – (2 x 1) – (2 x 1)

= 5.040 + 40.320 – 2 – 2

= 45.360 – 2 – 2

= 45.358 – 2

= 45.356 ✔

~CaraTerlampir

#NoCopas

#NoNgasal

#LearnMathwithBrainly

~CMIIW