•  Case I: We use TWO Rs. 50 notes - One possibility - 50(×2) + 1(×7) = 107

•  Case II: We use ONE Rs. 50 note -

•  Six possibilities (by adding Rs.10 note from none to five) –

•  50(×1) + 10(×0) + 1(×57) = 107; 50(×1) + 10(×1) + 1(×47) = 107; 50(×1) + 10(×2) + 1(×37) =

•  107; 50(×1) + 10(×3) + 1(×27) = 107; 50(×1) + 10(×4) + 1(×17) = 107; 50(×1) + 10(×5) + 1(×7) = 107;

•  Case III: We use no Rs. 50 note (Only Rs. 10 and 1 notes) - Ten possibilities

•  10(×10) + 1(×7) = 107; 10(×9) + 1(×17) = 107; 10(×8) + 1(×27) = 107; 10(×7) + 1(×37) = 107; 10(×6) + 1(×47) = 107; 10(×5) + 1(×57) = 107; 10(×4) + 1(×67) = 107; 10(×3) + 1(×77) = 107; 10(×2) + 1(×87) = 107; 10(×1) + 1(×97) = 107;

•  Case IV: We use only Rs. 1 note - One possibility - 1 (×107) = 107. •  So, total 18 possibilities.