QOD-31/05/13

Pn=(1+x)(1-x2)(1+x3)....(1-x4n)[(1+x)(1-x2)(1+x3)....(1-x2n)]2

Find lim(x→-1)Pn

4 Answers

283
Sahil Jain ·

dividing the numerator and denominator by (1-x)4n
writing like this
(1-x)(1-x)............(1-x)4n time for numerator
so it wil become 1.2.3.4......4n
for denomintor
(1-x)(1-x)....(1-x) 2n times
so it will be 1.2.3.4.5.6....2n)2
4nfacotrial / (2nfactorial)2
so ans is 4nC2n

1352
Manish Shankar ·

???

1352
Manish Shankar ·

Try this

answer is 4nC2n

11
Debargha Paul ·

1???

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