find x , this question is from the chapter permutation&combinations
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find x , this question is from the chapter permutation&combinations
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Answer:
1/6!+1/7!=x/8!
1/(6!)+1/(7×6!)=x/(8×7×6!)
1+1/7=x/(8×7)
8/7=x/(8×7)
8=x/8
x=64