GATE Papers >> CSE >> 2019 >> Question No 15

Question No. 15 CSE | GATE 2019

Let $ U=\{1,2,\;...\;,\;n\}. $ Let $ A=\{(x,\;X)\;\vert x\in X,\;X\subseteq U\}. $ Consider the following two statements on |A|.

I.  $ \vert A\vert=n2^{n-1} $

II. $ \vert A\vert={\textstyle\sum_{k=1}^n}k\begin{pmatrix}n\\k\end{pmatrix} $

Which of the above statements is/are TRUE?


Answer : (C) Both I and II


Solution of Question No 15 of GATE 2019 CSE Paper

Both I and II are equivalent statements.

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