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a. kpk15,2,10=30
2 x2 1 x15 3 x3
______ - ______ + _____
15 x2 2 x15 10 x3
=4 15 9
___- _____ + ____
30 30 30
=-2
___
30
=-1
___
15
b. kpk 7, 14, 21 =42
3 x6 4 x3 13 x3
____+ ______ - ______
7 x6 21 x2 14 x3
=
18+12-39
_________
42
=- 9
____
42
=-3
____
14
c. kpk 5,3,4=60