1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Let x1, x2,...........,xn be n observations such that

$$\sum {x_i^2} = 400$$ and $$\sum {{x_i}} = 80$$. Then a possible value of n among the following is
A
18
B
15
C
12
D
9
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
If the roots of the equation $${x^2} - bx + c = 0$$ be two consecutive integers, then $${b^2} - 4c$$ equals
A
$$-2$$
B
$$3$$
C
$$2$$
D
$$1$$
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
The value of $$a$$ for which the sum of the squares of the roots of the equation $${x^2} - \left( {a - 2} \right)x - a - 1 = 0$$ assume the least value is :
A
$$1$$
B
$$0$$
C
$$3$$
D
$$2$$
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Let $R=\{(3,3),(6,6),(9,9),(12,12),(6,12)$, $(3,9),(3,12),(3,6)\}$ be a relation on the set $A=\{3,6,9,12\}$. The relation is :
A
reflexive and symmetric only
B
an equivalence relation
C
reflexive only
D
reflexive and transitive only
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