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Maths multiple choice help! Watch

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    https://gyazo.com/21f4ef7ec7359d293e9024025e2d6dc4

    https://gyazo.com/e0ae5b4b5f5bd6f12e6d902541ef0273


    How do you go about solving or whats the method behind doing the questions above?

    Lecturer hasn't posted the lecture online so I can't review it.

    Any help? :puppyeyes:
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    (Original post by XxKingSniprxX)
    https://gyazo.com/21f4ef7ec7359d293e9024025e2d6dc4

    https://gyazo.com/e0ae5b4b5f5bd6f12e6d902541ef0273


    How do you go about solving or whats the method behind doing the questions above?

    Lecturer hasn't posted the lecture online so I can't review it.

    Any help? :puppyeyes:
    First lot: just do the division. You can see that 875 is divisible by 5, so divide by 5 and see what's left.

    Second one: go through and count the primes. 31 is prime, 33 isn't (3 goes into it), 35 isn't (5 goes into it), 37 is, etc.
 
 
 
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