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    Queries about which subject to drop!

    I am currently doing 13 units for the HSC and would like to drop a subject. Do you think it would be wiser for me to drop Chemistry (in which I am ranked 8th out of ~88 students) or English Extension (in which I am ranked 2nd out of 70ish students)? Thank you in advance!
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    Induction Question:

    Um, can someone help me with this question? Prove by induction that f(n) = n^2 +n + 41 is prime for n=0, 1, 2... 40 but not for 41. I can't seem to prove it. D: Thank you in advance!!
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    Chemistry Question:

    Hello, can someone help me with this question? D: The gas chlorine (cl2) and ammonia (NH3) are easily distinguished by their odours. If a canister of each had their tops removed, which odour would you smell first? Explain. Thanks in advance. :D
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