1.

If a denotes the number of permutation of n different things taken all at a time, b the number of permutation ofn - 2 different things taken 10 at a time and c, the number of permutations ofn - 12different things taken all at a time such thata = 182 bc, then value of n is:

Answer»

`10`
`12`
`14`
`18`

Solution :`=4((cos^(2)BETA-sin^(2)beta)/(sin^(2)beta))=4((1-2sin^(2)beta)/(sin^(2)beta))=4((1-2sinalpha.cosalpha)/(sin^(2)beta))=4((sinalpha-cosalpha)/(sin beta))^(2)gt0`


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