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If the lines ax+12y+1=0, bx+13y+1=0 and ...

If the lines ax+12y+1=0, bx+13y+1=0 and cx+14y+1=0 are concurrent, then a,b,c are in:

A

H.P

B

G.P.

C

A.P

D

none of these

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JBD PUBLICATION-MODEL PAPER (13)-EXERCISE
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  2. Let the angles A, B, C of triangle ABC be in A.P. and let b:c= sqrt3:s...

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  3. If the lines ax+12y+1=0, bx+13y+1=0 and cx+14y+1=0 are concurrent, the...

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  4. The equation of a parabola whose focus is (-3,0) and dielectrix is x+5...

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  5. Let y=x/(x+5), then value of (dy)/(dx) is:

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  6. If P(A)=P(B)=x and P(AcapB)=P(barAcapbarB)=1/3, then the value of x is...

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  7. In a circle of diameter 40 cm, the length of a chord is 20 cm. Find th...

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  8. Prove the following: cos^2 2x - cos^2 6x = sin 4x sin 8x

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  9. Simplify: (1-i)^2/(1+i)^2

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  10. Show that the middle term in the expansion of (1+x)^(2n) is (1.3.5….(2...

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  11. Write the general term in the expansion of (x^2-y)^6.

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  12. Using section formula, prove that the three points (-4,6,10), (2,4,6) ...

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  13. Find the component statement of the following and check whether they a...

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  14. In a group of 65 people, 40 like cricket, 10 like both cricket and ten...

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  15. If f (x) =x^3-1/x^3, find the value of f (x) +f (1/x).

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  16. Prove that:(tan^2 20- tan^2 theta)/(1- tan^2 20 tan^2 theta)=tan30 tan...

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  17. Prove, by Mathematical Induction, that for all n in N, 2.7^n+3.5^n-5...

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  18. How many different numbers between 100 and 1000 can be formed from the...

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  19. The ratio of the.A.M. and G.M. of two positive numbers a and b is m : ...

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  20. If the sum to infinity of the series 3+5r+7r^2+………is 44/9. Find r.

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