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1.Set Theory
medium
જો $X = \{ {4^n} - 3n - 1:n \in N\} $ અને $Y = \{ 9(n - 1):n \in N\} ,$ તો $X \cup Y$ = . . . . .
A
$X$
B
$Y$
C
$N$
D
એકપણ નહી.
(JEE MAIN-2014)
Solution
$ x=\left\{4^{n}-3 n-1\right\} $
$=\{0,9,54, \ldots\} $
$ Y =\{9(n-1)\} $
$=\{0,9,18,27, \ldots\} $
$ \therefore X U Y=Y $
Standard 11
Mathematics
