MATLAB: How to count occurrences of a number in a column in relation to an other column occurrence

Question

i need to count occurrences of a number in a column in relation to an other column occurrence so e.g

A=

4 2 1

2 2 1

1 1 2

1 1 7

1 2 1

i need the number of times column 2 has a 1 while column 3 has a 7 so [any,1,7] and column 1 has a 2 while column 3 has a 7 so [2,any,7] I've tried

sum(A(:,2:3)==[1,7])

but that just gets the number of 1 and the number 7

(the real mat that i have to do is large)

Answer 1

took some time but there a way

sum(A(:,2)==1 & A(:,3)==7)