A student takes two tests, T1T_1T1 and T2T_2T2. P(T1)=0.8P(T_1) = 0.8P(T1)=0.8, P(T2∣T1)=0.7P(T_2|T_1) = 0.7P(T2∣T1)=0.7, and P(T2∣T1c)=0.4P(T_2|T_1^c) = 0.4P(T2∣T1c)=0.4. What is P(T1∣T2)P(T_1|T_2)P(T1∣T2)?
0.857
0.750
0.625
0.900