... 19 20 21 22 23 24 25 26 27 28 ?(7) x ?(4)=6 x 2=12; So ?(7 x 4) = ?(7) x (4) is true. 2) ?(6 x 4)=?(6) x ?(4); ?(6)=2; 1 2 3 4 5 6 ?(4)=2; I have found ?(4) already. ?(6 x 4)= ?(24)=8; I have found ?(24) already. ?(6) x ?(4)=2 x 2=4; So ?(6 x 4)=?(6) x ?(4) is true. b) ?(5 x 2)=?(5) x ?(2); ?(5)=4; I have found ?(5) already. ?(2)=1; 1 2 ?(5 x 2)= ?(10)=4; 1 2 3 4 5 6 7 8 9 10 ?(5) x ?(2)=4 x 1=4; So ?(5 x 2)=?(5) x ?(2) is true. ?(7 x 3)=?(7) x ?(3); ?(7)=6; I have found ?(7) already. ?(3)=2; I have found ?(3) already. ?(7 x 3)= ?(21)=12; 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ?(7) x ?(3)=6 x 2=12; So ?(7) x ?(3)=6 x 2=12 is true. ?(4 x 5)=?(4) x ?(5); ?(4)=2; I have found ?(4) already. ?(5)=4; I have found ?(5) already. ?(4 x 5)= ?(20)=8; 1 2 3 4 ...

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