ตัวเลขมหัศจรรย์ ตอนที่ 6

จำนวนที่มีเลข 4 อยู่ระหว่าง 123 กับ 321

111 * 1111 = 123321
1111 * 1111 = 1234321
11111 * 1111 = 12344321
111111 * 1111 = 123444321
1111111 * 1111 = 1234444321
11111111 * 1111 = 12344444321
111111111 * 1111 = 123444444321
1111111111 * 1111 = 1234444444321
11111111111 * 1111 = 12344444444321
111111111111 * 1111 = 123444444444321
1111111111111 * 1111 = 1234444444444321
11111111111111 * 1111 = 12344444444444321

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