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# JEE Class main Answered

Respected Ma'am/Sir. I have doubt in Question no. 2. Sir/Ma'am I always get confusion in how to iota summation or even normal summation. Like such a large numbers like 200,300,400 etc..... How to do summation. How to cancel the terms. I would be grateful if you teach in detail about it.
Asked by pranavsrinivas82 | 19 Jan, 2024, 11:11: PM
Expert Answer

Powers of imaginary number i are  i , -1 , -i and +1 .  These numbers are periodic as shown below

hence  is

-----------------------------------------------

Similarly , is

Hence ,

Hence x = 0 , y = 1

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