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Question : 18 of 160
Marks:
+1,
-0
Solution:
Let,
x=(1+y)n−1 So,
x=ny+y2 +y3+.... =+()2+()3 +.... Compare first three terms then,
ny= ,y2= ()2 ,y3=( )3 From first two relation,
= =( )2 y=− =− And,
n=− This implies ,
| (−)(−−1)(−−2) |
| 3! |
(−)3 =()3 =RHS So,
x=(1−)− −1 =√5−1 = This implies,
x+ =√5−1+ =
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