WB JEE 2010 | Sequence and Series Question 14 | Mathematics

WB JEE 2010

MCQ (Single Correct Answer)

-0.25

Sum of n terms of the following series 1³ + 3³ + 5³ + 7³ ......... is

n²(2n² $$-$$ 1)

n³(n $$-$$ 1)

n³ + 8n + 4

2n⁴ + 3n²

WB JEE 2010

MCQ (Single Correct Answer)

-0.25

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

5, 20

4, 25

2, 50

1, 100

WB JEE 2010

MCQ (Single Correct Answer)

-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

$$n = - {1 \over 2}$$

$$n = {1 \over 2}$$

n = 1

n = $$-$$ 1

WB JEE 2010

MCQ (Single Correct Answer)

-0.25

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

$$2\sin \left( {{{A - C} \over 2}} \right)$$

$$2\cos \left( {{{A - C} \over 2}} \right)$$

$$\cos \left( {{{A - C} \over 2}} \right)$$

$$\sin \left( {{{A - C} \over 2}} \right)$$

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