Self Maths Puzzle Logical Reasoning

2+5+8= 16 04 20
4+6+9= 36 45 51
6+7+3= 18 12 ?

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Self Other Question

choose the odd one out from 2,5,10,50,500,5000? what is the value of log 0 on base 10
such that 10^x=0
x=????