Teaching DSSSB TGT Mock Test 2025 Mathematics Elementary Number Theory Congruence

The linear congruence ax ≡ b(mod n) has a solution if and only if,

1
d | a, where d = (a, n)
2
d | b where, d = (b, n)
3
d | b where, d = (a, n)
4
d | a where, d = (b, n)
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