21. let s ={a:a= lajlsx5, aj =0 or 1, i, j, za, =1, vi and a=1, vj} then, the number of elements in s is (a) 54 (c) 5! i (b) 55 (d) 55 22. the number of 4 digit

21. Let S ={A:A= lajlsx5, aj =0 or 1, i, j, Za, =1, vi and a=1, Vj} Then, the number of elements in S is (a) 54 (c) 5! i (b) 55 (d) 55 22. The number of 4 digit numbers with no two digits 22. The Common is a) 4536 c) 5040 10 sn(b) 3024 (d) 4823 uwith a > 2.Which