Re: [計量] PP-PS1
※ 引述《minimumi (米尼)》之銘言：
: For a finite sequence of nonzero numbers, the number of variations
: in sign is defined as the number of pairs of consecutive terms of
: the sequence for which the product of the two consecutive terms is
: negative. What is the number of variations in sign for the sequence
: 1, -3, 2, 5, -4, -6 ?
: (A) One
: (B) Two
: (C) Three
: (D) Four
: (E) Five
: 想請問這題該怎麼解~
: 謝謝
畫圖萬能!
由以下圖可知
因為正副號轉變的次數 = 經過0那條線的次數 = 3
選(C)
有錯誤請指教 多謝 ^^
5 ●
/ \
4 / \
/ \
3 / \
/ \
2 ● \
/ \
1 ● / \
\ / \
0 --------------------------------------------------------------
\ / \
-1 \ / \
\ / \
-2 \ / \
\ / \
-3 ● \
\
-4 ●
\
-5 \
\
-6 ●
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 220.137.90.184
推
08/24 20:09, , 1F
08/24 20:09, 1F
討論串 (同標題文章)
GMAT 近期熱門文章
PTT職涯區 即時熱門文章