Answer :

I. 12,15 and 21

12 = 2^{2}×3

15 = 3×5

21 = 3×7

LCM = 2^{2}×3×5×7 = 420

HCF = 3

II. 17,23 and 29

17 = 1×17

23 = 1×23

29 = 1×29

LCM = 1×17×23×29 = 11339

HCF = 1

III. 8, 9 and 5

8 = 2^{3}

9 = 3^{2}

5 = 1×5

LCM = 2^{3}×3^{2}×5 = 360

HCF = 1

IV. 72 and 108

72 = 2^{3}×3^{2}

108 = 2^{2}×3^{3}

LCM = 2^{5}×3^{5} = 7776

HCF = 2^{2}×3^{2} = 4×9 = 36

V. 306 and 657

306 = 2×3^{2}×17

657 = 3^{2}×73

LCM = 2×3^{2}×17×73 = 22338

HCF = 3^{2} = 9

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