The answer is 918 k2 R* v! D9 t; g i
1 row 3x4+1x3=15
, q' h9 p7 W3 C% _1 f3 ?2 row 4x5+2x4=28
4 m( n. b+ W8 i4 c2 j4 W. Y& L公仔箱論壇3 row 5x6+3x5=45
4 {* U0 O8 D F6 vtvb now,tvbnow,bttvb4 row 6x7+4x6=66
; s# x5 W) n* i& N5.39.217.77:88985 row 7x8+5x7=91  |