In memory heirachy, whenever some data is to be read, first data is to be searched in M1, if the data is found in M1 then system returns the value from there and counted as a hit. If the value is not found in M1 i.e. <Miss for M1> then it accesses M2 and returns the value from there. Since nothing is given about miss in M2, I am assuming that it is the main memory and there is no miss there.
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