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IF 1/(8!) +1/(9!) = x/(10!) , find x....

IF `1/(8!) +1/(9!) = x/(10!)` , find x.

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  14. Find 'n' if 9xx ^((n-1))P3 = ^nP4 .

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  16. In how many ways can a group of 12 students be selected from 15 studen...

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  17. (0!)/(1!)=……..

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  20. ^nC(n-1)=….

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