1
WB JEE 2010
MCQ (Single Correct Answer)
+1
-0.25

G.M. and H.M. of two numbers are 10 and 8 respectively. The numbers are

A
5, 20
B
4, 25
C
2, 50
D
1, 100
2
WB JEE 2010
MCQ (Single Correct Answer)
+1
-0.25

The value of n for which $${{{x^{n + 1}} + {y^{n + 1}}} \over {{x^n} + {y^n}}}$$ is the geometric mean of x and y is

A
$$n = - {1 \over 2}$$
B
$$n = {1 \over 2}$$
C
n = 1
D
n = $$-$$ 1
3
WB JEE 2010
MCQ (Single Correct Answer)
+1
-0.25

If angles A, B and C are in A.P., then $${{a + c} \over b}$$ is equal to

A
$$2\sin \left( {{{A - C} \over 2}} \right)$$
B
$$2\cos \left( {{{A - C} \over 2}} \right)$$
C
$$\cos \left( {{{A - C} \over 2}} \right)$$
D
$$\sin \left( {{{A - C} \over 2}} \right)$$
4
WB JEE 2010
MCQ (Single Correct Answer)
+1
-0.25

The value of $${2 \over {3!}} + {4 \over {5!}} + {6 \over {7!}} + $$ ............ is

A
e1/2
B
e$$-$$1
C
e
D
e1/3
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