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Verified answer
Bilangan ratusan : abcAngka tersedia : 0,1,2,3,....,9
ada 10 angka
a - b = 3 atau b - a = 3
abc:
30c
41c
52c
63c
74c
85c
96c
ada 7 kombinasi yg mungkin
bac :
14c
25c
36c
47c
58c
69c
ada 6 kombinasi
Total ada : 13
c : 0,1,2,3,...,9 ---> 10 angka
Maka, banyak bilangan ratusan dg ratusan dan puluhan memiliki selisih 3
= 13 × 10
= 130 bilangan