Defining summation range

hi
I’m quite newbie to the gams. I have a problem defining a limited range for a summation below:
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please help me writing this equation properly.

If you want help here, you need to make an attempt. Read the tutorial, get started, if you get stuck, post a concrete questions.

-Michael

hi
actually i did lots of attemps.
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Why don’t you share the attempts, so we can reproduce the issue? Screenshot don’t help.

-Michael

thank you.i fixed it!
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