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= 6! / 2! 2!
= 6.5.4.3.2.1 / 2.1.2.1
= 6.5.3.2.1
= 180
NB : huruf yg sama= 1. 2 huruf s sehingga mnjdi 2! 2. 2 huruf a shingga mnjdi 2!