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Sequences and S...

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  • Question 1
    4 / -1

    If the 7th term of HP is 1/10 and the 12th term is 1/25, then the 20th term is

  • Question 2
    4 / -1

    If a1, a2, a3,...,a are in HP, then the expression a1a2 + a2a3 + ...+an-1an is equal to

  • Question 3
    4 / -1

    If AM and HM between two numbers are 27 and 12 respectively, then their GM is

  • Question 4
    4 / -1

    If a, a1, a2, ,...,a2n,b are in arithmetic progression and a, g1, g2,..,g2n,b are in geometric progression and his the harmonic mean of a and b, then

  • Question 5
    4 / -1

    The sum of the product of the numbers ± 1 ± 2 ±...± n, taken two at a time, is

  • Question 6
    4 / -1

    If y = 3χ + 6χ2 + 10χ3 +..., then the value χ in terms of y is

  • Question 7
    4 / -1

    The sum of series 1 + 3/2 + 7/4 + 15/8 + 31/16 +... up to n terms is equal to

  • Question 8
    4 / -1

    For any integer n ≥ 1,

  • Question 9
    4 / -1

    Sum of n terms of the series 1/2 + 3/4 + 7/8 + 5/16 + ...is

  • Question 10
    4 / -1

    If α ,β and γ are the roots of the equation χ2 - pχ + q = 0, then the values of

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