Day 157: NDA Maths

1. A.
   $\{\phi, \{\phi\}, \{\lambda\}, \{\lambda, \mu\}\}$
2. B.
   $\{\phi, \{\lambda\}, \{\{\lambda, \mu\}\}, \{\lambda, \{\lambda, \mu\}\}\}$
3. C.
   $\{\phi, \{\lambda\}, \{\lambda, \mu\}, \{\lambda, \{\lambda, \mu\}\}\}$
4. D.
   $\{\{\lambda\}, \{\lambda, \mu\}, \{\lambda, \{\lambda, \mu\}\}\}$

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1. A.
   5
2. B.
   6
3. C.
   7
4. D.
   8

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1. A.
   2
2. B.
   3
3. C.
   4
4. D.
   5

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1. A.
   $\dfrac{\left|\vec{a}+\vec{b}\right|^{2}}{4}$
2. B.
   $\dfrac{\left|\vec{a}-\vec{b}\right|^{2}}{4}$
3. C.
   $\dfrac{\left|\vec{a}+\vec{b}\right|^{2}}{2}$
4. D.
   $\dfrac{\left|\vec{a}-\vec{b}\right|^{2}}{2}$

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1. A.
   $x+y=5$
2. B.
   $z=5$
3. C.
   $z=0$
4. D.
   $x+y+z=5$

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