1
AIEEE 2006
+4
-1
If $${{a_1},{a_2},....{a_n}}$$ are in H.P., then the expression $${{a_1}\,{a_2} + \,{a_2}\,{a_3}\, + .... + {a_{n - 1}}\,{a_n}}$$ is equal to
A
$$n({a_1}\, - {a_n})$$
B
$$(n - 1)({a_1}\, - {a_n})$$
C
$$n{a_1}{a_n}$$
D
$$(n - 1)\,\,{a_1}{a_n}$$
2
AIEEE 2006
+4
-1
Let $${a_1}$$, $${a_2}$$, $${a_3}$$.....be terms on A.P. If $${{{a_1} + {a_2} + .....{a_p}} \over {{a_1} + {a_2} + .....{a_q}}} = {{{p^2}} \over {{q^2}}},\,p \ne q,\,then\,{{{a_6}} \over {{a_{21}}}}\,$$ equals
A
$${{41} \over {11}}$$
B
$${7 \over 2}$$
C
$${2 \over 7}$$
D
$${{11} \over {41}}$$
3
AIEEE 2005
+4
-1
If $$x = \sum\limits_{n = 0}^\infty {{a^n},\,\,y = \sum\limits_{n = 0}^\infty {{b^n},\,\,z = \sum\limits_{n = 0}^\infty {{c^n},} } } \,\,$$ where a, b, c are in A.P and $$\,\left| a \right| < 1,\,\left| b \right| < 1,\,\left| c \right| < 1$$ then x, y, z are in
A
G.P.
B
A.P.
C
Arithmetic-Geometric Progression
D
H.P.
4
AIEEE 2005
+4
-1
Out of Syllabus
The sum of the series $$1 + {1 \over {4.2!}} + {1 \over {16.4!}} + {1 \over {64.6!}} + .......$$ ad inf. is
A
$${{e - 1} \over {\sqrt e }}\,$$
B
$${{e + 1} \over {\sqrt e }}$$
C
$${{e - 1} \over {2\sqrt e }}$$
D
$${{e + 1} \over {2\sqrt e }}$$
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