Please answer the question number 14 with proper steps
Ashutosh Rath , 6 Years ago
Grade 11
Discuss with Askiitians Tutors> Please answer the question number 14 with...
1 AnswersAditya Gupta
Last Activity: 6 Years ago
nth term is an=(n^2 – n+1)*(n – 1)!
now if we let f(n)= n*n! then
an= f(n) – f(n-1)
this sum telescopes to give
Sn= f(n) – f(0) = n*n! – 0= n*n!
but n*n!= 4000*4000!
so n= 4000
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