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The 7th and 13th terms of an A.P. are 34...

The 7th and 13th terms of an A.P. are 34 and 64 respectively, 1 Then its first term difference are:

A

4, 5

B

5, 4

C

9, 4

D

4, 9

Text Solution

Verified by Experts

The correct Answer is:
B, D
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Knowledge Check

  • The first and last elements of an A.P are a and l respectively. If S is the sum of all terms of the A.P, then the common difference is

    A
    1)`(l^(2)-a^(2))/(2 S-(l+a))`
    B
    2)`(l^(2)-a^(2))/(2 S-(l-a))`
    C
    3)`(l^(2)+a^(2))/(2 S+(l+a))`
    D
    4)`(l^(2)+a^(2))/(2 S-(l+a))`

  • If the 4th , 7 th and 10th term of a G.P. be a,b,c respectively, then the relation between a,b,c is :

    A
    `b = ( a+c)/(2)`
    B
    `a^(2) = bc`
    C
    `b^(2) = ac `
    D
    `c^(2) = ab`

  • The first and last element of an A.P are 7 and 55 respectively. The sum of 10^(th) element from the beginning and 10^(th) element from the end is

    A
    115
    B
    25
    C
    69
    D
    62

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