Question
Find the remainder when the number (400n + 247) is
divided by 20.Solution
ATQ, 400n + 247 = (20 × 20n) + (20 × 12) + 7 = 20 × (20n + 12) + 7 Since, 20 × (20n + 12) is completely divisible by 20 So, the remainder will be 7.
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