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[" Q.13-The arrangement of "(1-i)/(1+i)"...

[" Q.13-The arrangement of "(1-i)/(1+i)" is:- "],[[" a) "(-pi)/(2)," b) "(pi)/(2)," c) "(3 pi)/(2)],[" Q.14-If "^(n+1)C_(3)=2times^(n)C_(2)" then "n=?]]

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((x+iy)/(2+3i)+(2+i)/(2-3i)=(9)/(13)(1+i)

The value of sum_(i=1)^(13) (n^(n) + i^(n-1)) is

Ex.-1 Q.13-21

Match the arrangment of P and Q (column I) with its formula (column II)

Q.sum_(n=1)^(13)(i^(n)+i^(n+1))=(-1+i),n in N

The value of sum_(n=1)^(13)(i^(n)+i^(n+1)),i=sqrt(-1) is