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Standard X

Mathematics

Sum of First n Natural Numbers

The 7th term ...

Question

The 7^th term is of an A.P. is 30 and the 13^th term is 54.What is the sum of first n terms?

2N(n + 1)

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N(n + 1)

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2n(n + 2)

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2N(n + 2)

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Solution

The correct option is C
2n(n + 2)

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Similar questions

Q. The

7^{t h}

term of an A.P. is

20

and its

13^{t h}

term is

32

. Find the first term of A.P.

Q. The 7^th term of an A.P. is 32 and its 13^th term is 62. Find the A.P.

Q. If the

7 t h

term of an A.P. is

15

and

13 t h

term is

27

, find the

n t h

term.

7^{t h}

term of an A.P. is

40

. Then the sum of first

13

terms is:

The sum of first n terms of an A.P. whose first term is 8 and the common difference is 20 is equal to the sum of first 2n terms of another A.P. Whose first term is -30 and common difference is 8. Fnd n.

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The 7th term is of an A.P. is 30 and the 13th term is 54.What is the sum of first n terms?

The correct option is C 2n(n + 2)

The 7^th term is of an A.P. is 30 and the 13^th term is 54.What is the sum of first n terms?

The correct option is C
2n(n + 2)