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How many terms of A.P. -6, (-11)/2 , -5 ...

How many terms of A.P. `-6, (-11)/2 , -5` …… are needed to obtain a sum -25?

A

10 or 15

B

15 or 18

C

5 or 20

D

8 or 12

Text Solution

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The correct Answer is:
C
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Knowledge Check

  • How many terms of a G.P.3, 3^2 , 3^3 ,……….. Are needed to give the sum 120?

    A
    4
    B
    3
    C
    -4
    D
    5

  • How many terms of the G.P. 3, (3)/(2),(3)/(4) , . . . . . . are needed to give the sum (3069)/(512) is

    A
    20
    B
    15
    C
    10
    D
    16

  • If the sum of n terms of an A.P. is n P +(1)/(2) n (n - 1) Q , where P and Q are constants, then the common difference is

    A
    1
    B
    Q
    C
    P
    D
    P-Q

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