Suppose the letters has a corresponding different positive integral value(s). What is the value of ?
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There are two possible values of R ,either a 1 or 2. If we choose 1, we can possibly inspect that the 1st digit of the product is 1 which is not divisible by 4. So, we can only choose R=2 . Then after that, S=8 .
Likewise, A should be either 1 & 2, If we choose A=1 then it follows T=7 which complete the scenario.
Therefore R A T S = 2 1 7 8 R + A + T + S = 1 8