Let s =a:a = [a,s.s, a, = 0 or 1, vii2a, =1 vi and )a, =1 vi then, the number of elements in s is (a) (c) 52 (b) 55 5! (d) 55

5! is correct answer as for first row you have 5 choices then for second it's 4 choice similarly for last one you have no choice

if you are satisfied with this accept this as best answer

option c is correct

see this. this is permutation question. for first 1 you have 5 choices in first row. whatever you choose. once you fix a position so for the second row you will have only 4 choi...

for first row value 1 has five choice and for second row it has 4 choice

option c is correct it is a permutations matrix