•
abcd
.......2__×
.........
1000__+
dcba
0 ≤ d ≤ 5 tdk mungkin
d = 6
a = 2
b ganjil
0 ≤ b ≤ 6 tdk mungkin
b = 7
2b + 1 = ..c
c = 5 ✘
b = 9
2b + 1 = ...c
c = 9 ✔
abcd = 2996
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•
abcd
.......2__×
.........
1000__+
dcba
0 ≤ d ≤ 5 tdk mungkin
d = 6
a = 2
b ganjil
0 ≤ b ≤ 6 tdk mungkin
b = 7
2b + 1 = ..c
c = 5 ✘
b = 9
2b + 1 = ...c
c = 9 ✔
abcd = 2996