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Q.

If x = 4 (mod 7), then positive values of x are

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a

{1, 8, 15, ...}

b

{4, 8, 12, ....}

c

{4, 11, 18, ......}

d

{11, 18, 25, ...}

answer is A.

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Detailed Solution

x4=7λx=4+7λ, λI

Putting λ=0, 1, 2, 3 we get x=4, 11, 18.....

 Option (a) is the correct answer.

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