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What is the common difference of an A P. in which `a_21-a_7=84`

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  1. What is the common difference of an A P. in which a21-a7=84

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  2. If a tower 30 m high, casts a shadow 10sqrt3 m long on the ground, th...

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  3. The probability of selecting a rotten apple randomly from a heap of 90...

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  4. Find the value of p, for which one root of the quadratic equation px^2...

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  5. Which term of the sequence 20 ,19 1/4, 18 1/2, 17 3/4,dot is the first...

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  6. Prove that the tangents drawn at the end points of a chord of a circle...

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  7. A circle touches all the four sides of a quadrilateral ABCD. Prove tha...

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  8. If the point P(x, y) is equidistant from the points A(5, 1) and B(-1,5...

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  9. If (a^2+b^2)x^2+2(ab+bd)x+c^2+d^2=0 has real roots then

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  10. In an A.P. first term is 5, last term is 45 and sum = 400 . Find the n...

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  11. On a straight line passing through the foot of a tower, two points C a...

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  12. A bag contains 15 white and some black balls. If the probability of d...

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  13. In what ratio does the point (24/11,y) divide the line segment joinin...

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  14. Three semicircles each of diameter 3 cm, a circle of diameter 4·5 cm a...

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  15. Water in a canal, 2·4 m wide and 1·8 m deep, is flowing with a speed o...

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  16. The slant height of a frustum of a cone is 4 cm and the perimeters ...

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  17. Solve for x : 1/(x+1)+3/(5x+1)=5/(x+4), x != -1,-1/5,-4

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  18. Two taps running together can fill a tank in 3(1/13) hours. If one tap...

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  19. If the ratio of the sum of first n terms of two AP's is (7n+1) : (4n +...

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  20. Prove that the length of the tangents drawn from an external point to ...

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