Mathematics
Senior High
่ณๆฅใงใ๐ฆ
ใชใๅๆฐใง่จ็ฎใใใฎใใใใใใชใใฎใง๏ฝคๆใใฆใใ ใใ๐โโ๏ธ
โ
โ
ๅใใใชใ
182
ๅณใฎๅณใฎใใใซ,้่ทฏใ็ข็คใฎ็ฎใฎใใใซใชใฃใๅฐๅใใใใ
ๆฌกใฎๅ ดๅใๆ็ญ่ท้ขใง่กใ้้ ใฏไฝ้ใใใใใ
(1) A ใใ B ใธ่กใใ ( 10็น)
(01) ESANET
็ท6ไบบใๅฅณ2ไบบใๅๅฝขใฎใ
ๅฅณๅญ2ไบบใ
T (S)
(2) AใใCใ้ใฃใฆBใธ่กใใ (10็น)
(N
A
Cl
[82 ๅณใซ1ๅบ็ป้ฒใใใจใใไธใซ1ๅบ็ป้ฒใใใจใโใง่กจใใ
(1) A ใใ B ใซๆ็ญ่ท้ขใง่กใ้้ ใฎ็ทๆฐใฏใ5ๅใฎใจ4ๅ
ใฎโใ1ๅใซไธฆในใ้ ๅใฎ็ทๆฐใซ็ญใใใ
ใใฃใฆ, ๆฑใใ้้ ใฎ็ทๆฐใฏ
=126 (้ใ)
4!
2!2!
9!
5!4!
(2) AใใCใซๆ็ญ่ท้ขใง่กใ้้ ใฎ็ทๆฐใฏ
C ใใ B ใซๆ็ญ่ท้ขใง่กใ้้ ใฎ็ทๆฐใฏ
ใใฃใฆ, ๆฑใใ้้ ใฎ็ทๆฐใฏ
4!
5!
X =60 (้ใ)
2!2! 3!2!
5!
3!2!
้ใ
้ใ
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