Find value of i1325, where \({\rm{i}} = \sqrt { - 1} \), is

  1. i
  2. -i
  3. 1
  4. -1

Answer (Detailed Solution Below)

Option 1 : i
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Detailed Solution

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Concept:

Power of i:

  • i = \(\sqrt{-1}\)
  • i2 = -1
  • i3 = -i × i2 = -i
  • i4 = (i2)2 = (-1)2 = 1
  • i4n = 1

 

Calculation:

\(\Rightarrow i^{1325}=i^{(1324+1)}\)

\(=(i^{4})^{331}\times i\)

\(=1\times i\)           [∵ i4n = 1]

\(=i\)

\(\therefore i^{1325}=i\)

Hence, option 1 is correct 

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