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Please tell how they calculate it sir please see attachment please

Please tell how they calculate it sir please see attachment  please 

Grade:12

2 Answers

Sher Mohammad IIT Delhi
askIITians Faculty 174 Points
7 years ago
attachement is not visible, please write the quesion on forum , otherwise not possible to help you.
milind
23 Points
7 years ago
=5 +n/1 + n(n-1) / 2! + ….....+ n!/n!
next step I want to understand 
(1+1)^n + 4 = 2^n + 4 

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