@viveksaini2846

Hi Mohit,

No the trigger will not invoke on change of rollup and formula field updates....

@itsRikinHere

Generally trigger doesn't fire on formula field updates.

@rohanjangid2823

yes the trigger on the parent object will get fired as the field on the object is getting changed but only fire if the trigger.new is included in the logic

@AbhishekMishra-ps1oq

Yes the trigger will run till the time count field on parent is getting updated with new value.

@GauravSengupta

yes the trigger will run, as the trigger is on the parent obj and not in the child object and there is a change in the parent record due to the rollup summary ....ofcource the condition is that a new child is added. If in the question the trigger was in the child obj then that Tigger wouldn't gave fired

@ShaileshKumar69

Can somebody tell me why trigger on parent will not fire? Any explanation?

@mehersurya

No trigger wont fire on rollup summary fields

@krishanamohan3489

Yes trigger is invoked 
For before and after update 
I implemented  and checked it.

@SudharshanM-d4h

Hii
Trigger will not fire on formula field
But fire on Rollup summary as per google

@anshikaahuja209

Trigger won’t fire on formula and rollup fields

@pavannandan498

No the trigger will not fire