For 3 sets A,B,C if A$\subset B,B\subset C$ then

$A B$ সরলরেখার সমীকরণ, $y=-\frac{3}{2} x+3$

$f: R \rightarrow R, g: R \rightarrow R$ যথাক্রমে $f(x)=\frac{x}{\sqrt{x-a}}, a \in R$, এবং $g(x)=2 x+1$ দ্বারা সংজ্ঞায়িত।

$\operatorname{cosec} 7 \theta$ এর পর্যায় কত?

Suppose $A_1 , A_2,... A_{30}$ are thirty sets each having 5 elements and $B_1, B_2,..., B_n$ are n sets each with 3 elements , let $\underset{i = 1}{\overset{30}{\cup}} A_i = \underset{j = 1}{\overset{n}{\cup}} B_j = S$ and each element of S belongs to exactly 10 of the $A_i's$ and exactly 9 of the $B_j'S$. then n is equal to