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    Solid rotaion

    Hi I need help with question 32. ii). I solved it and got 24pi, but feel as if it's wrong. If someone can help me out it would be great
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    hopefully my last question for proofing

    This is hopefully my last question for proofing if x,y,z \in real numbers and x \neq y \neq z i) prove x^2 + y^2 + z^2 > yz + zx + xy ii) if x + y + z = 1, show yz + zx + xy < 1/3
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    Proofing question

    Question 25.ii)
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    Contrapositivity question

    Question 15. If ab is divisible by 3, prove by contrapositive that a or b is divisible by 3.
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    More proofing i cant do

    If anyone can solve question 34 it will be really helpful.
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    Proof and induction questions

    If anyone can solve question 31 it will be really helpful.
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    Induction

    If anyone can solve question 40. (ii) it would be appreciated
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    Proof by induction question. It's been rotting my brain. Question 50

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