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ÀÛ¼ºÀÚ Uploader : fatman ÀÛ¼ºÀÏ Upload Date: 2019-08-17º¯°æÀÏ Update Date: 2019-08-17Á¶È¸¼ö View : 327

±×¸²°ú °°ÀÌ °¢ ´Ü°è¸¶´Ù »ç°¢ÇüÀÌ Ãß°¡µÇ´Â º¯È­¿¡¼­ n ´Ü°è¿¡¼­ ÇÊ¿äÇÑ ¸·´ëÀÇ °³¼ö an À» ±¸ÇÑ´Ù.

n = 1 ÀÏ ¶§, a1 = 4

n = 2 ÀÏ ¶§, a2 = 4 + 6 = 10

n = 3 ÀÏ ¶§, a3 = a2 + 6 + 2 = 4 + 6*2 + 2 = 18

n = 4 ÀÏ ¶§, a4 = a3 + 6 + 2*2 = 4 + 6*3 + 2*(1+2) = 28

n = 5 ÀÏ ¶§, a5 = a4 + 6 + 2*3 = 4 + 6*4 + 2*(1+2+3) = 40

n = 6 ÀÏ ¶§, a6 = a5 + 6 + 2*4 = 4 + 6*5 + 2*(1+2+3+4) = 54

¡¦

n = n ÀÏ ¶§, an = 4 + 6*(n-1) + 2*(1+2+3+¡¦+n-2)

1+2+3+¡¦+n-2 = (n-2)*(n-1)/2 À̹ǷÎ,

an = 4 + 6*(n-1) + (n-1)*(n-2) °¡ µÈ´Ù.


*** Âü°í¹®Çå[References] ***

an = 4 + 6*(n-1) + (n-1)*(n-2)
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