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7th term of an A.P. is 40. then the sum ...

7th term of an A.P. is 40. then the sum of the first 13 terms is

A

520

B

53

C

2080

D

1040

Text Solution

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The correct Answer is:
A
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The sum of the first 8 terms of an A.P. is 100 and the sum of its first 19 terms is 551. Find the first term and the common difference of the AP.

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Knowledge Check

  • If the sum of first n terms of an A.P. is cn^(2) , then the sum of squares of these n terms is :

    A
    `( n ( 4n^(2) - 1) c^(2))/( 6)`
    B
    `( n ( 4n^(2) + 1) c^(2))/( 3)`
    C
    `( n ( 4n^(2) - 1) c^(2))/( 3)`
    D
    `( n ( 4n^(2) + 1) c^(2))/( 6)`

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    If the sum of first p terms of an A.P is equal to the sum of the first q terms , then find the first (p+q) terms .

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    The sum of the first four terms of an A.P. is 56. The sum of the last four terms is 112. If its first term is 11, then find the number of terms.

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