The system of equations
\matrixαx+y+z=α−1\crx+αy+z=α−1\crx+y+αz=α−1\cr
has no solutions, if α is :
Mathematicsmatrices-and-determinants2005medium
If a1,a2,a3,........,an,..... are in G.P., then the determinant
$\Delta = \left| {\matrix{
{\log {a_n}} & {\log {a_{n + 1}}} & {\log {a_{n + 2}}} \cr
{\log {a_{n + 3}}} & {\log {a_{n + 4}}} & {\log {a_{n + 5}}} \cr
{\log {a_{n + 6}}} & {\log {a_{n + 7}}} & {\log {a_{n + 8}}} \cr
} } \right|$
is equal to :
Mathematicsmatrices-and-determinants2005medium
If a2+b2+c2=−2 and
f\left( x \right) = \left| {\matrix{
{1 + {a^2}x} & {\left( {1 + {b^2}} \right)x} & {\left( {1 + {c^2}} \right)x} \cr
{\left( {1 + {a^2}} \right)x} & {1 + {b^2}x} & {\left( {1 + {c^2}} \right)x} \cr
{\left( {1 + {a^2}} \right)x} & {\left( {1 + {b^2}} \right)x} & {1 + {c^2}x} \cr
} } \right|,
then f(x) is a polynomial of degree :
Mathematicsprobability2005easy
Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the three apply for the same house is :
Mathematicsprobability2005easy
A random variable X has Poisson distribution with mean 2.
Then P(X>1.5) equals :
Mathematicsprobability2005medium
Let A and B two events such that P\left( {\overline {A \cup B} } \right) = {1 \over 6},P\left( {A \cap B} \right) = {1 \over 4} and P\left( {\overline A } \right) = {1 \over 4}, where A stands for complement of event A. Then events A and B are :
Mathematicsdifferential-equations2005medium
The differential equation representing the family of curves y2=2c(x+c), where c>0, is a parameter, is of order and degree as follows:
Mathematicsdifferential-equations2005medium
If x{{dy} \over {dx}} = y\left( {\log y - \log x + 1} \right), then the solution of the equation is :
If non zero numbers a,b,c are in H.P., then the straight line {x \over a} + {y \over b} + {1 \over c} = 0 always passes through a fixed point. That point is :
The line parallel to the x - axis and passing through the intersection of the lines ax+2by+3b=0 and bx−2ay−3a=0, where (a,b)=(0,0) is :
Mathematicsmathematical-induction2005easy
If A = \left[ {\matrix{
1 & 0 \cr
1 & 1 \cr
} } \right] and I = \left[ {\matrix{
1 & 0 \cr
0 & 1 \cr
} } \right], then which one of the following holds for all n≥1, by the principle of mathematical induction?
Mathematicsbinomial-theorem2005medium
The value of 50C4+r=1∑656−rC3 is
Mathematicsbinomial-theorem2005medium
If the coefficient of x7 in {\left[ {a{x^2} + \left( {{1 \over {bx}}} \right)} \right]^{11}} equals the coefficient of x−7 in {\left[ {ax - \left( {{1 \over {b{x^2}}}} \right)} \right]^{11}}, then a and b satisfy the relation
Mathematicsbinomial-theorem2005medium
If x is so small that x3 and higher powers of x may be neglected, then {{{{\left( {1 + x} \right)}^{{3 \over 2}}} - {{\left( {1 + {1 \over 2}x} \right)}^3}} \over {{{\left( {1 - x} \right)}^{{1 \over 2}}}}} may be approximated as
Mathematicsbinomial-theorem2005medium
If the coefficients of rth, (r+1)th, and (r + 2)th terms in the binomial expansion of (1+y)m are in A.P., then m and r satisfy the equation
Mathematicsindefinite-integrals2005medium
\int {{{\left\{ {{{\left( {\log x - 1} \right)} \over {1 + {{\left( {\log x} \right)}^2}}}} \right\}}^2}\,\,dx} is equal to