[" Q-21Let Abe the set of 4digit numbers...

[" Q-21Let Abe the set of 4digit numbers a "a_(2)a_(3)a_(4)" where "a_(1)>a_(2)>a_(3)>a_(4)" then "n(A)" is equal to "],[[" (A) "sqrt(26)," (B) "84," (C) "210," (D) None of these "]]

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