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Find the sum of the series 1^(2) - 2^(2)...

Find the sum of the series `1^(2) - 2^(2) - 3^(2) - 4^(2) + 5^(2) - 6^(2) +…` up to 2n terms.

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The correct Answer is:
`-n(2n+1)`
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CHHAYA PUBLICATION-SEQUENCE AND SERIES-Exercise 9 B (Short Answer Type Questions)
  1. If a, b, c are In A.P., then show that, (1)/(b c), (1)/(c a), (1)/(a...

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  2. If the pth , qth and rth terms of an A.P. be P, Q and R respectively t...

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  3. If (b+c)/(a), (c+a)/(b), (a+b)/(c ) are in A.P. show that (1)/(a), (1)...

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  4. Let a(a != 0) is a fixed real number and (a-x)/(p x) = (a-y)/(qy) = (a...

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  5. If a+c = 2b and ab + cd + ad = 3bc, prove that the four numbers a, b, ...

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  6. Find the least value of n for which the sum of the series 20 + 28 + 36...

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  7. The nth term of a series in A.P. is an + b. Find the sum of the series...

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  8. Find the sum of the series 1^(2) - 2^(2) - 3^(2) - 4^(2) + 5^(2) - 6^(...

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  9. The perpendicular of a right angled triangle is 9 cm and the three sid...

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  10. If the xth term of an A.P. is (1)/(y) and its yth term is (1)/(x) then...

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  11. An A.P. consists of n terms. If the sum of its first three terms is x ...

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  12. If S be the sum of first (2n+1) terms of an A.P and the sum of terms i...

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  13. The sum of first p terms of an A.P. is (p^(2))/(n) and the sum of its ...

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  14. If the A.M. of (1)/(b-a) and (1)/(b-c) is (1)/(2(b-x)), then show that...

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  15. A farmer undertakes to pay off a debt of Rs. 2700 by monthly instalmen...

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  16. A person pays Rs.975 in monthly instalments, each instalment is less t...

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  17. If 1 paisa is saved today, 2 paise next day, 3 paise succeeding day an...

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  18. The cost of sinking a tubewell is 25 paise for the first metre and an ...

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  19. The rate of monthly salary of an office assistant is increased annuall...

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  20. The angles of a polygon are in A.P. lying common difference 5^(@). If ...

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