Question

(2) 2/2
4. The value of lim
?
(d) none of these
1.n+2. (n-1) + 3. (n - 2 + ... + n.1
-, is :
1² + 2² + ... + n²
(b)-1
(a) 1
(c)
2
NI-​

Answer 1

Answer:

(2+i)(2+2i).....(2+ni)=x+yi.....(1)

(2+i)(2+2i).....(2+ni)=x-yi......(2)

multiply(1)&(2)

5.8.13......(4+n^2)=x^2+y^2