"not a" vs "not any"

Hi there, are both not a and not any sound natural in the following examples?

  1. Yesterday was mothers' day but I did not post any photos with my mother on social media. I think importance of my mother to my life cannot be described by just clicking pictures or posting them on social sites on mother's day.
  2. Yesterday was mothers' day but I did not post photo with my mother on social media. I think importance of my mother to my life cannot be described by just clicking a picture or posting it on social sites on mother's day.
  3. Yesterday I visted a tiger reserve for the first time. After searching for hours I could not find a tiger.
  4. Yesterday I visted a tiger reserve for the first time. After searching for hours I could not find any tigers.
Original Post

Hi there, do both not a and not any sound natural In the following context? Are they both grammatical? And if I use 'not a' in an exam, will I be marked down?

  • Parliament elections in india are near. Today an opinion poll was held that says Abc party will win 250 seats, Xyz party will win 100 seats and others will not win a seat/any seats.

As both mean others will win Zero seats so I think both forms are correct. Could you please explain?

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