MCQ
Let two numbers have arithmetic mean 9 and geometric mean 4.Then, these numbers are the roots of the quadratic equation:
- Ax2 + 18x + 16 = 0
- Bx2 - 18x + 16 = 0
- Cx2 + 18x - 16 = 0
- Dx2 - 18x - 16 = 0
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The total number of 9 digit numbers which have all different digits is.
Let S = {x | x is a positive multiple of 3 less than 100} P = {x | x is a prime number less than 20}. Then n(S) + n(P) is.