Question

a+(b+c)=(a+b)+c state which property involved

Answer 1

This property is called associative property.

The associative property becomes important because it allows the mathematician, you, to add or multiply numbers with ease. ... The associative property can only be used for addition and multiplication, not for subtraction or division.

Answer 2

It  is Associative property of addition

you can identify it when same nos are grouped differently