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  1. O

    hard Sequence and Series Question!!

    Sorry, I know this was a post a LOOONNGG time ago but why is d=1? Though you did say you made a replica series with 1+2+3+4+5... but may I ask of how exactly you derived that? If anyone passing this knows, please reach out. I'm sorry if it's a intuitive question, I just don't get the reasoning...
  2. O

    Excel HSC book?

    ive heard success one is the best thing to have while preparing for ur hsc
  3. O

    Should I do 12 units or 10?

    drop to 10U, you'll thank yourself later on :)
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