$ABCDE$ is a pentagon. Forces $\overrightarrow{AB}, \overrightarrow{AE}, \overrightarrow{DC}, \overrightarrow{ED}$ act at a point. Which force should be added to this system to make the resultant $2\overrightarrow{AC}$?
- A$\overrightarrow{AC}$
- B$\overrightarrow{AD}$
- C$\overrightarrow{BC}$
- D$\overrightarrow{BD}$
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$(C)$ $PH _3$ boils at lower temperature than $NH _3$
$(D)$ The $N - N$ single bond is stronger than the $P - P$ single bond
Based on the compounds of group $15$ elements, the correct statement($s$) is (are)
$(A)$ $Bi _2 O _5$ is more basic than $N _2 O _5$
$(B)$ $NF _3$ is more covalent than $BiF _3$
$(C)$ $PH _3$ boils at lower temperature than $NH _3$
$(D)$ The $N - N$ single bond is stronger than the $P - P$ single bond
If $\alpha+\beta+\gamma=2 \theta$,then $\cos \theta+\cos (\theta-\alpha)+\cos (\theta-\beta)+\cos (\theta-\gamma)$ is equal to
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The number of subsets of $\{1, 2, 3, \ldots, 9\}$ containing at least one odd number is
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