lookoutastroboy
Member
- Joined
- Mar 15, 2008
- Messages
- 202
- Gender
- Male
- HSC
- N/A
HEY GUYS,
i need help solving these two problems and if you could supply ur answers and solutions to each one, that'd be greatly appreciated.
(A) 121 (B) 117 (C) 112 (D) 115 (E) 105
Thanks in advance, lookoutastroboy
(P.S. if you could tell me the specific mathematical methods to approach each question, that'd also be another great help!!! )
(Side note: I've also posted the 2 same questions above in the Maths Extension 1 forums)
i need help solving these two problems and if you could supply ur answers and solutions to each one, that'd be greatly appreciated.
9. What is the maximum size of a subset,
P, of {1, 2, 3, . . . , 50} with the property that no pair of distinct elements of P
has a sum divisible by 7?
(A) 21 (B) 22 (C) 23 (D) 24 (E) 25
(A) 21 (B) 22 (C) 23 (D) 24 (E) 25
10.
How many three-digit numbers from 100 to 999 inclusive
have one digit which is the average of the other two?
have one digit which is the average of the other two?
(A) 121 (B) 117 (C) 112 (D) 115 (E) 105
Thanks in advance, lookoutastroboy
(P.S. if you could tell me the specific mathematical methods to approach each question, that'd also be another great help!!! )
(Side note: I've also posted the 2 same questions above in the Maths Extension 1 forums)