Because of the A main core present in the unit and B are in the tens. Therefore, the aba is 100a + 10b + a.Because of the C is in the hundreds, and the main unit. D is in the tens.Therefore, cdc is 100c + 10d + c.Therefore, the aba cdc + = (100a + 10b + a) + (100c + 10d + c). = 100( a + c ) + 10( b + d ) + ( a + c )
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