1.

There are two sets of parallel lines, their equations being x cos alpha+y sin alpha=p and x sin alpha- y cos alpha=p , p=1,2,3,….n and alpha in (0,pi//2). If the number of rectangles formed by these two sets of lines is 225, then the value of n is equals to

Answer»

`4`
`5`
`6`
`7`

Solution :`(C )` `"^(N)C_(2)*^(n)C_(2)=225impliesn=6`


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