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If the sum of first n even natural numbe...

If the sum of first n even natural number is 240. find the value of n.

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The correct Answer is:
`n=15` or `n=15`
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CPC CAMBRIDGE PUBLICATION-MODEL QUESTION PAPER -04 -QUESTIONS
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  2. Find the remainder using remainder theorem, when 2x^(3)+3x^(2)+x+1 is ...

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  3. If the sum of first n even natural number is 240. find the value of n.

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  4. The sum of n natural numbers is 325. find n.

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  5. Is every square similar to every Rectangle ? Why ?

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  6. Find the HCF of 105 and 1515 by prime factorization method.

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  7. If Sin theta = 4/5 and Cos theta=3/5 find the value of Sin^(2)theta+Co...

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  8. Find the value of 4 sin^(2)60+3 tan^(2)30-8 sin45.cos45

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  9. Find the volume of the hemisphere of radius 21 cm.

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  10. Prove that n^(2)-n is divisible by 2 for every positive integer n.

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  11. Solve for x and y 41x+53y=135 53x+41y=417

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  12. Find the roots of the quadratic equation 9x^(2)-3x-20=0 by formula met...

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  13. If A(-2, -1) B(a, 0) C(4, b) and D(1 , 2) are the vertices of a paral...

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  14. In given figure, (AO)/(OC)=(BO)/(OD)=1/2 and AB=5cm. Find the value of...

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  15. A child has a dice whose six faces show the letters are given below : ...

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  16. Prove that (Sin theta)/(1-cos theta)=cosec theta+cot theta OR P...

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  17. The sum of digits of a two digit number is 7. If the digits are revers...

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  18. The zeroes of the cubic polynomial x^(3)-6x^(2)+3x+10 are in A.P. for ...

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  19. In a class test, the sum of Sharma age markes in Mathematics and Engli...

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  20. What type of triangle is DeltaABC, with the coordinates of the vertice...

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