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Janusz
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Wendy Ye
The sum of the series 2 x 1 x 20c4 - 3 x 2 x 20c5 +4x 3 x 20c6- 5x 4 X20c + ... + 18 x 17 × 20C20,
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5 months ago
The sum of the series 2 x 1 x 20c4 - 3 x 2 x 20c5 +4x 3 x 20c6- 5x 4 X20c + ... + 18 x 17 × 20C20,
![2 - {2 - [2 - (2 - 2) - 2]} = ?](http://i.ytimg.com/vi/VTPaDiCAnSU/mqdefault.jpg "2 - {2 - [2 - (2 - 2) - 2]} = ?")
![[2 ÷ 2 (2 + 2)] \/ 2 =❓ Mathematical Numerical Expression 😃 MANY GET IT WRONG❗ Basic Mathematics](http://i.ytimg.com/vi/F_n-yLHwk6g/mqdefault.jpg "[2 ÷ 2 (2 + 2)] \/ 2 =❓ Mathematical Numerical Expression 😃 MANY GET IT WRONG❗ Basic Mathematics")
