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2014-05-04T17:18:01+03:00
28. 
n:12⇒C1, R=7⇒n=12×C1+7⇒n-7=12
n:28⇒C2, R=7⇒n=28×C2+7⇒n-7=28
n:36⇒C3, R=7⇒n=36×C3+7⇒n-7=36
n-7=c.m.m.m.c (12,28,36)
12=2^2×3
28=2^2×7
36=2^2×3^2
c.m.m.m.c=2^2×7×3^2=4×7×9=252
252×3=756⇒n-7=756
                   n=756+7
                   n=763
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