state gov RPSC 2nd Grade Senior Teacher Mock Test Series 2025 Mathematics Elementary Number Theory Congruence
Find all the incongruent solutions of the congruence 18x ≡ 30(mod 42).
1
3, 12, 19, 26, 33, 40
2
4, 11, 18, 25, 32, 39
3
2, 15, 6, 8, 4, 2
4
no solution exists
5
Question Not Attempted