Question

CH-2 (W
Q1. State which property the following represent:
(a) 50 + ( 28 + 140) = (50+ 28)+ 140
(b) ax b = b xa
(c) 25 +0=25 = 0+ 25
(d) 23 x 1= 1x 23
(e) 6X (2x 7) = (6x 2) x 7
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Answer 1

I dont know the answer.