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No of Temporary Variable required

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Consider the following $3-$address code.

$t_1=t+e$

$t_2=g+a$

$t_3=t_1+t_2$

$t_4=t_2+t_2$

$t_5=t_4+t_3$

There are five temporary variables in above code. The minimum number of temporary variables that can be used in the equivalent optimised $3-$address code of above code are ______________.

Can anyone Confirm How many temporary variables required here.? I got 3 .
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Two temporary Variables are required
t1 = t+e

t2 = g+a

t1 = t1*t2

t2 = t2+t2

t1=t1+t2

Correct me if I am wrong.

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