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dindevdindev 

how can i show count of contact for each account through admin not trigger and md relationship.how can i write formula for that count of contact

Raj VakatiRaj Vakati
I dnt think so you can able to do it with the process builder or other config work .. 

Or You have an option ( Use this package  -
Declarative Lookup Rollup Summaries Tool

https://appexchange.salesforce.com/listingDetail?listingId=a0N3000000B45gWEAR

OR

you need to use the trigger ....