1

IIT-JEE 1994

MCQ (Single Correct Answer)
If $$In\left( {a + c} \right),In\left( {a - c} \right),In\left( {a - 2b + c} \right)$$ are in A.P., then
A
$$a,\,b,\,c$$ are in A.P.
B
$${a^2},\,{b^2},\,{c^2}$$ are in A.P.
C
$$a,\,b,\,c$$ are in G.P.
D
$$a,\,b,\,c$$ are in H.P.
2

IIT-JEE 1990

MCQ (Single Correct Answer)
The number $${\log _2}\,7$$ is
A
an integer
B
a rational number
C
an irrational number
D
a prime number
3

IIT-JEE 1988

MCQ (Single Correct Answer)
Sum of the first n terms of the series $${1 \over 2} + {3 \over 4} + {7 \over 8} + {{15} \over {16}} + ............$$ is equal to
A
$${2^n} - n - 1$$
B
$$1 - {2^{ - n}}$$
C
$$n + {2^{ - n}} - 1$$
D
$${2^n} + 1$$
4

IIT-JEE 1985

MCQ (Single Correct Answer)
If $$a,\,b,\,c$$ are in GP., then the equations $$\,\,\alpha {x^2} + 2bx + c = 0$$ and $$d{x^2} + 2ex + f = 0$$ have a common root if $${d \over a},\,{e \over b},{f \over c}$$ are in ________.
A
A.P.
B
GP.
C
H.P.
D
none of these

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