Question
Geography books are never together.
In how many ways 5 History books and 7 geography books can be arranged in a row so that :Solution
No. of when Geography book are always together = 7! × 6! Total no. of ways when all the books are arranged without any condition = 12! No. of when Geography book are never together = 12! – (7! × 6!)
Find the difference between angle and its complement if the angle is three-seventh of its complement.
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