The answer is 91
/ W' Y9 O) v9 y/ }/ Q$ r1 row 3x4+1x3=15tvb now,tvbnow,bttvb0 P7 S) z& a* t" @" `) l
2 row 4x5+2x4=28
9 h1 P8 X+ L) P4 J) K0 Y3 row 5x6+3x5=45公仔箱論壇2 D6 w0 Z4 T8 P4 t- c
4 row 6x7+4x6=66
. H$ o! R: c( ~& J. ?# k5 \1 E3 m/ Sos.tvboxnow.com5 row 7x8+5x7=91  |