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Number sense question
Posted:
Mon Apr 08, 2013 10:29 amby RobinK
Is there an easier way to find the remainder instead of just dividing it out? 112358/6 has a remainder of ___ Answer: 2
How many 2-element or 3-element subsets does the set { e, m, p, t, y } have? Answer: 20
12345 x 8 + 5 = ___ Answer : 98765
Re: Number sense question
Posted:
Mon Apr 08, 2013 3:50 pmby martillaso
1) Add up 1+1+2+3+5+8=20 then divide 20 by 6 and you get r2
2) I did
{5 \choose 2} + {5 \choose 3} = 20, but I'm not too sure if that's the right step
Re: Number sense question
Posted:
Mon Apr 08, 2013 5:11 pmby BlasianAsian
Does that adding up trick work for any other number besides 6 and 9?
Re: Number sense question
Posted:
Mon Apr 08, 2013 5:30 pmby qwerty123
[unparseable or potentially dangerous latex formula] is correct because it's just asking how many ways can you split the set up to 2 or 3 elements.
@BlasianAsian: the trick also works with 3
Oh and just multiply it out for the last one. (that's what i do)
Re: Number sense question
Posted:
Mon Apr 08, 2013 5:42 pmby 101dalmatians
Re: Number sense question
Posted:
Mon Apr 08, 2013 6:17 pmby nsguy1350
Re: Number sense question
Posted:
Mon Apr 08, 2013 9:43 pmby BlasianAsian
LoL, forgot that it works with three. Thanks for clarifying.