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    What formula have you tried to use? I have voted to close. You've shown no research effort and your question reads like it's a homework question and you just want some one to give you the answer. Instead, please edit your question and show your attempts, it makes it easier for us to see where it's gone wrong
    – Dave
    Commented Dec 16, 2016 at 8:28
  • Sorry I had the impression this forum was to help each other. Yes, I would like someone to give me the answer !
    – Rachel A
    Commented Dec 16, 2016 at 8:58
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    it's not so obvious it's incorrect, surely you need to use "s around letter scores too, ("WT"), and it doesn't have the same logic as you've described, but otherwise it seems ok. What exactly the issue is with it? (Yes, this forum is to help each other, but not in a dumb way, instead we try to really understand the issue before helping, and that requires well written questions too.) Commented Dec 16, 2016 at 9:07