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ATQ,
As we know the least number which is divisible by 'a', 'b', and 'c' is the LCM of 'a', 'b', and 'c'.
So, the number which is completely divisible by 21, 28, and 42 = LCM of
21, 28, and 42 = 84
So, 'P' = 84 + 4 = 88
Now,
(5P - 10) = (88 × 5) - 10 = 440 - 10 = 430
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