A. only when m = n
B. only when m ≠ n
C. only when m = -n
D. for all m and n
If x *y=x2 + y2 – xy, then the value of 9*11 is:
[{√196-√64}*-2.5]=(?)
If 3x – 4y + z = 7; 2x – z + 3y = 19; x + 2y + 2z = 24, then what is the value of z ?
The number of positive integers n in the range 12 ? n? 40 such that the product (n – 1) (n –2)…3.2.1 is not divisible by n is
If 4x + 5y = 83 and 3x/2y = 21/22 how much is y – x
Solve for real x: 6x2 + 5x - 6 ≥ 0
If x=1+2a+3a2+4a2+……( -1 < a < 1 ) and y=1+3b+6b2+10b3+……( -1 < b < 1 )then find 1+ab+(ab)2+(ab)3+….. in terms of x and y.
The cost of 8 Sharpeners and 12 Pens is Rs. 76/- What is the cost of 20 Sharpeners and 30 Pens?
If n(x) = x2 - 10x, then n(-10) =
Let x and y be consecutive integers. Suppose m be the number of solutions of x3 − y3 = 3k2 and n be the number of solutions of x3 − y3 = 2t2,where k, t are integers. Then m + n equals: