Total number of equivalence relations defined in the set $S=\left\{a, b, c\right\}$ is?

f(x)=3^x ফাংশনটির-

1. ডোমেন [0,∞)

2. রেঞ্জ (0,∞)

3. $f^{- 1}{\left ( x \right )} = \frac{\ln{x}}{\ln{3}}$

নিচের কোনটি সঠিক? 

Given : $\displaystyle ax + by = d$ and $\displaystyle y= mx + c$.

Find $x$ in terms of $b, c, d$ and $m$.

Let $\displaystyle R = \{(x, x + 5) : x \in \{0,1, 2, 3, 4, 5\} \}$

Find dom $\displaystyle (R)$ and range $\displaystyle (R)$. And enter the common element between them.