18 + 19 + 20 in associative property
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18 + [19 + 20] = 18 + 39 = 57 .
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Step-by-step explanation:
Associative property
= a + ( b + c ) = ( a + b ) + c
= 18 + ( 19 + 20 ) = ( 18 + 19 ) + 20
= 18 + 39. = 37 + 20
= 57 = 57
therefore it is proved by associative property
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