If even parity is selected then the total number of 1's in the data, plus parity bit must be an even number.
If the number of 1's present in the data to be sent is odd then the parity bit generated is 1 so that the number of 1's become even
If already the number of 1's present in the data to be sent is even then the parity bit generated is 0 so that the number of 1's remains even.
Here the data to be sent is 110001001 and even parity is selected, so the number of 1's present should be even.
The number of 1's present is 4, which is even so the parity bit added at the end should be 0.
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