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# c12 2015 jan q5 Watch

1. part b)
i found the values from 1-100 which are 14 numbers divisible by seven then multipied the answer by 5 to find n and use in the equation.. i got 70 but the n in the markscheme was 71, why is it wrong 😢
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2. (Original post by pondsteps)
part b)
i found the values from 1-100 which are 14 numbers divisible by seven then multipied the answer by 5 to find n and use in the equation.. i got 70 but the n in the markscheme was 71, why is it wrong 😢
You're missing a number somewhere but I can't quite tell what's wrong with your approach. The way to do it is to note that 497 is divisible by 7 so there are 497/7 = 71 multiples of 7 between 1 and 500.
3. (Original post by Zacken)
You're missing a number somewhere but I can't quite tell what's wrong with your approach. The way to do it is to note that 497 is divisible by 7 so there are 497/7 = 71 multiples of 7 between 1 and 500.
ohhh alright..
but if u do it using my way is zero considered as a multiple?? cos no numbers are missing :/
4. (Original post by pondsteps)
ohhh alright..
but if u do it using my way is zero considered as a multiple?? cos no numbers are missing :/
Nopes, 0 doesn't count because it says between 1 and 500. I can see the fault with your method though, the latest multiple of 7 in your list from 1-100 is 98 but 98 * 5= 490, so you're missing the 497 term.
5. (Original post by Zacken)
Nopes, 0 doesn't count because it says between 1 and 500. I can see the fault with your method though, the latest multiple of 7 in your list from 1-100 is 98 but 98 * 5= 490, so you're missing the 497 term.
ohh okayyy.. thanks a lot
6. (Original post by pondsteps)
ohh okayyy.. thanks a lot
No worries.

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