[erlang-questions] Why the output differs in these two erlang expression sequence in shell?

[Greg]

In Erlang shell why the following produces different result?

    1> Total=15.
    2> Calculate=fun(Number)-> Total=2*Number end.
    3> Calculate(6).


**exception error: no match of right hand side value 12**

    1> Calculate=fun(Number)-> Total=2*Number end.
    2> Total=15.
    3> Calculate(6).


12
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