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isaphttp://webisa.webdatacommons.org/prov/
isahttp://webisa.webdatacommons.org/
n4gmatclub.
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provhttp://www.w3.org/ns/prov#
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isa:332548023
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But still it could be good for practice.We have 8 letters from which 6 are unique.Possible scenarios for 4 letter selection are:A. All letters are different;B. 2 N-s and other letters are different;C. 2 E-s and other letters are different;D. 2 N-s, 2 E-s.Let's count them separately:A. All letters are different, means that basically we are choosing 4 letters form 6 distinct letters: 6C4=15;B. 2 N-s
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n4:com
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isa:332548023