Pla deploys only 3brigades Plus several frontier regiments in tibet,which has less than 30000soldiers,i think. India deploys several corps along sino~india border.
Factually incorrect on both fronts...
The Indian Army has only the XIV corps available for operations at short notice along the LAC front. In proper terms, as of the current moment, the only Corps aimed towards Chinese Tibet. That too less a division commited to the CI grid in J&K
The III, IV corps, are heavily commited to COIN duties in the NE Theatre. The XXXIII corps too is in a similar predicament. It is almost completely defensive in nature, intended to hold the Chicken's neck. It is positioned closer to Bangladesh than to China, though an armoured brigade detailed to it is deployed in Sikkim.
As for the PLA formations stationed in tibet, a little info...
Within 48 hours of the start of the riots in Lhasa, T-90/89 armored personnel carriers and T-92 wheeled infantry fighting vehicles appeared on the streets as the 149th Division of the No. 13 Group Army under the Chengdu Military Region was dispatched to Lhasa.
The 149th Division is based at Leshan in Sichuan province.
As for the T-92 armored vehicles that appeared in Lhasa, the No. 52 Mountain Brigade of the Tibet Military Region received the vehicles around 2000.
Should China-India relations deteriorate to the verge of military confrontation and the riots in Tibet spread extensively, the first combat units of the PLA to be called to action would be the No. 52 and No. 53 Mountain Brigades under the Tibet Military Region.
The Chengdu military region maintains assets specifically for operations in Tibet. And the ability to deploy in as little as 48 hours.
If the T-90/89 armored personnel carriers used in Lhasa were indeed from the 149th Mechanized Rapid Reaction Division of the Chengdu Military Region, they were most likely transported first from Chongqing to Xining, then to Golmud to connect to the Qinghai-Tibet railway and continue on to Lhasa. The whole journey would take about 48 hours.-
Such troop movements would be much faster and cheaper than before. Calculated on the basis of being able to transport most of the heavy equipment of a whole mechanized division within 48 hours – it is unlikely that all the division's equipment would be moved – the PLA would be able to transport approximately 10 light mechanized divisions and some heavy mechanized divisions through the railroad to Tibet from the Lanzhou and Chengdu Military Regions within 30 days.-
The railway would allow the 61st Plateau Rapid Reaction Motorized Division of No. 21 Group Army under the Lanzhou Military Region and the 149th Rapid Reaction Motorized Division of the Chengdu Military Region to quickly enter Tibet.
India does not deploy military assets based solely on the numberthe opposition has in the region. The ability and capacity of the opponent to deploy large formations is also taken into consideration.
Btw, I stil have not posted the PLA war games in tibet region. That will give an idea of the formations tasked with operations against India.