Physics homework help. Define a relation R on ? as (a, b) ? R if and only if a and b, when written out, have the same number of 5s. For example, (1752, 95) ? R since they both have one 5 but (1752, 505) ? R since 1752 has one 5 but 505 has two 5s. Is R an equivalence relation? Prove that R is an equivalence relation.
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