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The value of sum sum(n=1)^(13) ( i^(n) +...

The value of sum `sum_(n=1)^(13) ( i^(n) + i^(n+1))` where `i= sqrt( -1)` , is equal to

A

i

B

i - 1

C

`-i`

D

0

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The correct Answer is:
B
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ML KHANNA-PROGRESSIONS -PROBLEM SET - 2 (MULTIPLE CHOICE QUESTIONS)
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  2. underset("n digits")((666…6)^(2)) + underset("n digits")((888…8)) is e...

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  4. If |a| lt 1 and |b| lt 1 , then the sum of the series a(a+b) + a^2...

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  6. If x = 1 + a + a^(2) + a^(3) +…"to" oo (|a| lt 1) and y = 1 b + b^(2) ...

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  10. If x = 1 + y + y^(2) + y^(3)+…"to"oo, then y is

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  11. (3)/(4)-(5)/(4^(2))+(3)/(4^(3))-(5)/(4^(4))+(3)/(4^(5))-(5)/(4^(6))+.....

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  12. If {:(x = a + a//r + a//r^(2)+......oo),(y = b - b//r + b//r^(2)-........

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  14. The vlaue of 9^(1//3)xx9^(1//9)xx9^(1//27)xx………oo is :

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  15. Find the value of (320(32)^(1//6)(32)^(1//36)oodot

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