Răspuns :
A=1000a+100b+10c+d+1000b+100c+10d+a+1000c+100d+10a+b+1000d+100a+10b+c
A=1111a+1111b+1111c+1111d
A=1111(a+b+c+d)
A=11*101(a+b+c+d) ( este divizibil, 3 punctulete cu) 101
A=1111a+1111b+1111c+1111d
A=1111(a+b+c+d)
A=11*101(a+b+c+d) ( este divizibil, 3 punctulete cu) 101
A = 1000a + 100b + 10c + d +
a + 1000b + 100c + 10d
10a + b + 1000c + 100d
100a + 10b + c +1000d
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A = 1111(a + b + c + d)
A = 101 * 11 * (a+b+c+d)
=> A = M₁₀₁
a + 1000b + 100c + 10d
10a + b + 1000c + 100d
100a + 10b + c +1000d
----------------------------------------------------
A = 1111(a + b + c + d)
A = 101 * 11 * (a+b+c+d)
=> A = M₁₀₁