maths/technology&otherfacts
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maths/technology&otherfacts
@mathtech789
daily maths questions/solution||other facts
lucknow, india Tham gia Mayıs 2016
6.3K Đang theo dõi12.9K Người theo dõi

@mathtech789 n! = n × [(n -1)!]
=> (x - 1)! = (x -1)[(x -1 -1)!]
=> (x - 1)! = (x -1)[(x - 2)!]
(x - 2)! ÷ (x - 1)! = 1 ÷ 4
=> (× - 2)! ÷ (× - 1)[(x - 2)!] = 1 ÷ 4
=> 1 ÷ (x - 1) = 1 ÷ 4
=> x - 1 = 4
=> x = 4 + 1
=> x = 5
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