Question # 1

The value of n, when ⁿP₂= 20 is

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3

4

6

5

The equation of the sphere thro' the origin and making intercepts a, b, c on co-ordinate axes is

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x²+ y²+ z²+ ax + by + cz = 0

x²+ y²+ z²- 2ax - 2 by - 2 cz = 0

x²+ y²+ z²= a + b + c

x²+ y²+ z²- ax - by - cz =0

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The angle between the vectors u =2i - i + k and v = -i + i is:

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3π/2

2π/3

5π/6

π/3

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1/3

1

3

None of these

To each element of a group there corresponds ______ inverse element

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Two

One

No

Three

graph of trigonometric function y = sec x does not meet

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x - axis

y -axis

both axis

None of these

An even function is symmetric about the line

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y = x

x = 0

y = -x

y = 0

For any real numbers x,y,xy=o ⇒

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x ≠ 0 ∧ y ≠ 0

x = 0 ∨ y = 0

x = 0

y = 0

The sum of an infinite geometric series exist if

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| r | < 1

| r | > 1

r = 1

r = -1

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