Doubt from chemical equilibrium

please show me how to calculate option c @Shwetanshu_2018 @Bhuvanitha_2020 @Samarth_2020 @Samrat_2020

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Bro ans given ( c is correct )it has given total presure equal to 6.75 atm they have multiplied 1.5 two times
@Ankith_2020

It doesn't make any sense to me. Let others try

Ok

I got my mistake (assuming initial mole to be 1 when it is given 1.5)

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