Home
Class 11
MATHS
The nth term of a sequence is given by a...

The nth term of a sequence is given by `a_n=2n+7.` find its 7th term.

A

14

B

20

C

21

D

28

Text Solution

Verified by Experts

The correct Answer is:
C
Put n `= 1 , 2 , 3, 4, ...., n`
The 7th term of an AP,
The given sequence are:
`9, 11, 13, ....`
...
Promotional Banner

Topper's Solved these Questions

  • BINOMIAL THEOREM

    RD SHARMA|Exercise Solved Examples And Exercises|228 Videos

Similar Questions

Explore conceptually related problems

The nth term of a sequence is a_(n)=2n+3 . Find its first four terms.

If sum of n terms of a sequence is given by S_(n)=2n^(2)+3n . Find its 50^(th) term.

The nth term of a sequence is given by a_(n)=2n^(2)+n+1. Show that it is not an A.P.

The nth term of a sequence is a_(n)=n^(2)+5 . Find its first three terms.

The general term of a sequence is given by a_(n)=-4n+15. Is the sequence an Avec P. If so,find its 15th term and the common difference.

If the sum of the first n terms of an AP is given by S_n=3n^2-n then find its nth terms, first term and common difference

If S_(n) the sum of first n terms of an AP is given by 2n^(2)+n, then find its nth term.

If the nth term a_(n) of a sequence is given by a_(n)=n^(2)-n+1 write down its first five terms.

The nth term of a sequence is (3n-7) . Find its 20th term.

RD SHARMA-ARITHMETIC PROGRESSIONS-Solved Examples And Exercises
  1. Which term of the sequence 72, 70, 68, 66,... is 40?

    Text Solution

    |

  2. Show that the sequence is an A.P. if its nth term is linear expression...

    Text Solution

    |

  3. The nth term of a sequence is given by an=2n+7. find its 7th term.

    Text Solution

    |

  4. The product of three numbers in A.P. is 224, and the largest number is...

    Text Solution

    |

  5. The fourth power of common difference of an arithmetic progression wit...

    Text Solution

    |

  6. The sum of three terms of an A.P. is 21 and the product of the first ...

    Text Solution

    |

  7. The internal angles of quadrilateral are in A.P. and their common diff...

    Text Solution

    |

  8. Find the sum of all natural between 250 and 1000 which are exactly ...

    Text Solution

    |

  9. Find the sum of first 20 terms of an A.P., in which 3r d terms in 7 an...

    Text Solution

    |

  10. Find the number of terms in the series 20 ,19 1/3,18 2/3... the sum of...

    Text Solution

    |

  11. The sums of n terms of three arithmetical progressions are S1, S2and ...

    Text Solution

    |

  12. If in an A.P. the sum of m terms is equal of n and the sum of n ter...

    Text Solution

    |

  13. The first , second and the last terms of an A.P. are a ,b , c respect...

    Text Solution

    |

  14. If (3+5+7+ u p tont e r m s)/(5+8+113 u p to10t e r m s)=7, then find...

    Text Solution

    |

  15. In a factory, 150 workers were engaged to finish a piece of work in a ...

    Text Solution

    |

  16. Prove that the sum of n arithmetic means between two numbers in n ti...

    Text Solution

    |

  17. If a ,b ,c are in A.P., then prove that: (a-c)^2=4(b^2-a c), a^3+...

    Text Solution

    |

  18. If a^2(b+c),b^2(c+a),c^2(a+b), are in A.P. show that either a ,b ,c ar...

    Text Solution

    |

  19. If n arithemetic means are inserted between 20 and 80 such tht the r...

    Text Solution

    |

  20. Along a road lie an odd number of stones placed at intervals of 10 met...

    Text Solution

    |