Un=n!/(n+2)! Then Sn= summation n=1 to n (Un) isPlz solve this as fast as possible
Ajudiya Janvi , 8 Years ago
Grade 11
Algebra> Un=n!/(n+2)! Then Sn= summation n=1 to n ...
1 Answers
Arun
Last Activity: 8 Years ago
Un = n!/(n+2)!
Un = n!/(n+2)(n+1)n!
Un = 1/(n+2)(n+1)
Un = 1/(n+1) - 1/(n+2)
Now put the value of n from 1 ,2,3....n
And add them
You get
= ½
Regards
Arun (askIITians forum expert)
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