▁the ▁individual ▁bet s ▁that ▁make ▁up ▁a ▁full ▁cover ▁bet , ▁including ▁singles ▁if ▁needed . ▁E . g . ▁if ▁a ▁successful ▁£ 1 0 ▁Yan kee ▁returned ▁£ 4 6 1 . 3 5 ▁then ▁the ▁overall ▁' od ds ▁multip lier ' ▁( OM ) ▁is ▁ 4 6 . 1 3 5 . ▁ ▁If ▁a , ▁b , ▁c , ▁d ... ▁represent ▁the ▁decimal ▁odd s , ▁i . e . ▁( f raction al ▁odd s ▁+ ▁ 1 ), ▁then ▁an ▁O M ▁can ▁be ▁calculated ▁algebra ically ▁by ▁multip lying ▁the ▁expressions ▁( a ▁+ ▁ 1 ), ▁( b ▁+ ▁ 1 ), ▁( c ▁+ ▁ 1 ). .. ▁etc . ▁together ▁in ▁the ▁required ▁manner ▁and ▁subtract ing ▁ 1 . ▁If ▁required , ▁( dec imal ▁odd s ▁+ ▁ 1 ) ▁may ▁be ▁replaced ▁by ▁( f raction al ▁odd s ▁+ ▁ 2 ). ▁ ▁Ex amples ▁ 3 ▁se lections ▁with ▁decimal ▁odd s ▁a , ▁b ▁and ▁c . ▁Exp and ing ▁( a ▁+ ▁ 1 )( b ▁+ ▁ 1 )( c ▁+ ▁ 1 ) ▁algebra ically ▁gives ▁abc ▁+ ▁ab ▁+ ▁ac ▁+ ▁b c ▁+ ▁a ▁+ ▁b ▁+ ▁c ▁+ ▁ 1 . ▁This ▁is ▁equivalent ▁to ▁the ▁O M ▁for ▁a ▁Pat ent ▁( tre ble : ▁abc ; ▁doubles : ▁ab , ▁ac ▁and ▁b c ; ▁singles : ▁a , ▁b ▁and ▁c ) ▁plus ▁