SOLUTION: in the set M={3, {6,7}, 9} is {{6,7}} a subset?

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Question 811292: in the set M={3, {6,7}, 9} is {{6,7}} a subset?
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
{6,7} is an element of M, so {{6,7}} should be considered a subset of M,
just like {3} or {9} .