The answer is 91( n( J0 o. b: g, x* m8 ^3 g1 l0 C
1 row 3x4+1x3=15
/ M) a: U/ g1 A i; G. C8 ~; E2 row 4x5+2x4=28
e' Q3 d( M8 `' _- y; F6 Q5.39.217.763 row 5x6+3x5=45
7 m6 g, ~. y+ M+ P3 c5.39.217.764 row 6x7+4x6=66! a2 O6 c" Y! I5 m, S
5 row 7x8+5x7=91  |