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If the n^(t h) term of an A.P. is 2n+...

If the `n^(t h)` term of an A.P. is `2n+1` , then the sum of first `n` terms of the A.P. is `n(n-2)` (b) `n(n+2)` (c) `n(n+1)` (d) `n(n-1)`

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
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  12. If the n^(t h) term of an A.P. is 2n+1 , then the sum of first n...

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  14. The sum of first 20 odd natural numbers is (a) 100       (b) 210  ...

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  16. The common difference of the A.P. 1/3,(1-3b)/3,(1-6b)/3,\ dot is (...

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  17. The common difference of the A.P. 1/(2b),(1-6b)/(2b),(1-12 b)/(2b),......

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  18. If k ,\ 2k-1 and 2k+1 are three consecutive terms of an A.P., the va...

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  19. The next term of the AP sqrt(7), sqrt(28), sqrt(63),… is

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