Find the number of prime numbers p such that `1999!+1 lt p lt 1999!+1999`

Find the number of distinct rational numbers x such that 0 lt x lt1 and x=p//q , where p ,q in {1,2,3,4,5,6} .

p, q and r are prime numbers such that p lt q lt r lt 13 . In how many cases would (p + q + r) also be a prime number?

If P and Q are two relatively prime number such that p+q =0 and p lt q . How fair are possible for (p,q)

Find the number of tangents drawn from the point (-1999 ,-2020) to the parabola y^(2)=x^2+x+1

Find the simple interest on Rs3285 from May 11,1999 to 11 September,1999 at 10% annum.

The percentag increases in the total number of students of a school over that in the previous year. Find the effective percentage increase in the number of students from 1998-1999 to 2000-2001.