Even when there are 3 buyers and even if supposingly one of the buyers share is for less than 50 Lacs, then also TDS provisions would be applicable because the provision is attracted if the value of property exceeds 50 Lacs.
As mentioned by other learned members, Tax shall be deducted as per the basis of apportioned value i.e their share in the property.
At the outset you mentioned that the value is 50 Crores, and in the subsequent paragraph you have mentioned that the consideration would be 48 Crores. I wish to know whether this value of 50 Crore is as per the Stamp duty Value/ Guidance value (a value as fixed by state govt. for collecting stamp revenue) ?
If, the answer to the above is affirmative then provisions of S.50C would be applicable and the sales value shall be deemed to be 50 Crores (unless you appeal or request AO to refer it to Valuation officer).
Since there are multiple owners of the properties, it must be ensured that TDS certificate is issued accordingly so that all the co-owners can get the credit of the tax so deducted.