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Which of the following linear congruence has no solution? (a) 3x = 9 (mod21) (b) 6x = 4 (mod20) (c) 9x = 7 (mod8)

Which of the following linear congruence has no solution? (a) 3x = 9 (mod21) (b) 6x = 4 (mod20) (c) 9x = 7 (mod8) (d) 18x = 23 (mod16)

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