The answer is 91* Q6 w2 P' e. m6 N B) j1 R/ X
1 row 3x4+1x3=15tvb now,tvbnow,bttvb/ ]/ l( |6 e+ g* D# k
2 row 4x5+2x4=28tvb now,tvbnow,bttvb3 i5 m, _3 ]! L" g3 l
3 row 5x6+3x5=45
4 W* F. h @: V1 t# J* m. ^7 }8 L4 row 6x7+4x6=66
% L1 c# v# u8 D, t4 R' [tvb now,tvbnow,bttvb5 row 7x8+5x7=91  |