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Question

Verify:
34+(56+78)=(34+56)+78
By which property, it holds true.

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Solution

34+(56+78)=(34+56)+78
L.H.S =34+(56+78)
=34+(20+2124)
=34+124
=1924.........(1)
R.H.S =(34+56)+78
=(91012)+78
=112+78
=2+2124
=1924........(ii)
From (i) and (ii) LHS = RHS .
Hence verified.
This is assosciative law of addition.

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