Question

If A=(2,5,6,9), B=(5,6,7,8,9) then find n(A-B)​

Answer 1

SoluTion :-

$\tt {A = (2, 5, 6, 9)}\\\\\tt {B = (5, 6, 7, 8, 9)}$

$\sf {\rightarrow n(A) = 4}\\\\\sf {\rightarrow n(B) = 5}$

→ n (A-B)​

Substituting The Values :-

$\sf {4 - 5 = (-1)}$