ISRO-2013-74

Question

The number of elements in the power set of the set {{A, B}, C} is

• A. $7$
• B. $8$
• C. $3$
• D. $4$

Comments

option D ?

Answer 1

No of elements of power set will be $2^{n}$ . here n is element of set 

so given set has 2 elements then power set has $2^{2}$ = 4 elements(Ans option d)

which are { $\phi$ , {A,B}, {C}, { { A,B},C} } 

Answer 2

TWO ELEMENTS SO NUMBER ELEMENTS =2^2=4

{   ∅,  {{A,B}},  {C},  {{A,B},C}  }

Comments

second element in the power set must be {{A,B}} right ?

---

YES CHK NOW