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If (a)/(2) is the first term and d is th...

If `(a)/(2)` is the first term and d is the common difference of an AP, then the sum of n terms of the AP is _______.

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The correct Answer is:
`(n)/(2)[a+(n-1)d]`
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PEARSON IIT JEE FOUNDATION-PROGRESSIONS-VERY SHORT ANSWER TYPE QUESTIONS
  1. The arithmetic mean of 7 and 8 is .

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  2. The arrangement of numbers (1)/(2), (-3)/(4), (-5)/(6), (-7)/(8),... i...

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  3. If (a)/(2) is the first term and d is the common difference of an AP, ...

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  4. In a sequence, if Sn is the sum of n terms and S(n-1) is the sum of (n...

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  5. If Tn = 3n +8, then T(n-1) = .

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  6. The sum of the first (n+1) natural number is .

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  7. For a series in geometric progression, the first term is a and the s...

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  8. In a series, starting from the second term, if each term its previous ...

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  9. All the multiples of 3 form a geometric progression. [True/False]

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  10. If a, b and c are in geometric progression then, a^(2), b^(2) and c^(2...

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  11. If every term of a series in geometric progression is multiplied by a ...

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  12. Geometic mean of 5, 10 and 20 is .

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  13. Sum of the infinite terms of the GP, -3, -6, -12, ... is 3. [True/Fals...

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  14. The reciprocals of all the terms of a series in geometric progression ...

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  15. The nth term of the sequence (1)/(100), (1)/(10000), (1)/(1000000), .....

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  16. Ina series, Tn = x^(2n-2) (x ne 0), then write the infinite series.

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  17. The harmonic mean of 1, 2 and 3 is (3)/(2). [True/False]

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  18. If a, b, c and d are in harmonic progression, then (1)/(a), (1)/(b), (...

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  19. If the AM of two numbers is 9 and their HM is 4, then their GM is 6. [...

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  20. If a, b and c are the arithmetic mean, geometric mean and harmonic mea...

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