1
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
If the arithmetic mean of two numbers a and b, a > b > 0, is five times their geometric mean, then $${{a + b} \over {a - b}}$$ is equal to :
A
$${{\sqrt 6 } \over 2}$$
B
$${{3\sqrt 2 } \over 4}$$
C
$${{7\sqrt 3 } \over {12}}$$
D
$${{5\sqrt 6 } \over {12}}$$
2
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
Out of Syllabus
If the sum of the first n terms of the series $$\,\sqrt 3 + \sqrt {75} + \sqrt {243} + \sqrt {507} + ......$$ is $$435\sqrt 3 ,$$ then n equals :
A
18
B
15
C
13
D
29
3
JEE Main 2017 (Offline)
+4
-1
Out of Syllabus
For any three positive real numbers a, b and c,

9(25$${a^2}$$ + b2) + 25(c2 - 3$$a$$c) = 15b(3$$a$$ + c).
Then
A
b, c and $$a$$ are in G.P.
B
b, c and $$a$$ are in A.P.
C
$$a$$, b and c are in A.P.
D
$$a$$, b and c are in G.P.
4
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
Out of Syllabus
Let z = 1 + ai be a complex number, a > 0, such that z3 is a real number.

Then the sum 1 + z + z2 + . . . . .+ z11 is equal to :
A
$$- 1250\,\sqrt 3 \,i$$
B
$$1250\,\sqrt 3 \,i$$
C
$$1365\,\sqrt 3 i$$
D
$$-$$ $$1365\,\sqrt 3 i$$
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