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    Am I allowed to use the sigma notation in my working out, rather than having to do the full calculation for S1 OCR?
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    (Original post by KingF)
    Am I allowed to use the sigma notation in my working out, rather than having to do the full calculation for S1 OCR?
    Either should be fine really, I can't see the examiners discriminate for simple addition. Although do make it as clear as possible.
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    Ah ok thanks. Because using sigma make it so much fast when doing probability questions.
 
 
 
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