Formula for addition of admittance element into bus

Q.  Which among the following formulae is used for addition of an admittance element into the bus?
- Published on 09 Oct 15

a. Yii new = Yii old - y
b. Yii new = Yii old + y
c. Yii new = Yii old - Yij old
d. Yii new = Yii old + Yij old

ANSWER: Yii new = Yii old + y

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