Find the value of `1+i^2+i^4+i^6++i^(2n)`

Find the value of ( i^2 + i^4 + i^6 + i^7 ) / ( 1 + i^2 + i^3 ) is ( a ) 1 - i ( b ) 1 + i ( c ) 2 - i ( d ) 2 + i

Find the value of: 1+ i^2 + i^4 + i^6 + i^8 +............+ i^20

Find the value of 1+i^2+i^4+i^6+i^8

Find the value of: i+ i^2 + i^3 + i^4

Find the value of i^4 + i^5 + i^6 + i^7

Find the value of : i^4 + i^5 + i^6 + i^7

Find the value of : i^4 + i^5 + i^6 + i^7