1
IIT-JEE 1984
+2
-0.5
If $$\,{a^2} + {b^2} + {c^2} = 1$$, then ab + bc + ca lies in the interval
A
$$[{1 \over 2},2]\,\,$$
B
$$[ - 1,2]$$
C
$$\,[ - {1 \over 2},1]\,$$
D
$$\,[ - 1,{1 \over 2}]\,\,$$
2
IIT-JEE 1982
+2
-0.5
The number of real solutions of the equation $${\left| x \right|^2} - 3\left| x \right| + 2 = 0$$ is
A
4
B
1
C
3
D
2
3
IIT-JEE 1982
+2
-0.5
Two towns A and B are 60 km apart. A school is to be built to serve 150 students in town A and 50 students in town B. If the total distance to be travelled by all 200 students is to be as small as possible, then the school should be built at
A
town B
B
45 km from town A
C
town A
D
45 km from town B
4
IIT-JEE 1982
+2
-0.5
If p, q, r are any real numbers, then
A
max (p, q) < max (p, q, r )
B
min (p, q) = $${1 \over 2}\left( {p + q - \left| {p - q} \right|} \right)$$
C
max (p, q) < min (p, q, r)
D
none of these
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