Home
Class 10
MATHS
In an AP, if d = -4, n = 7 and a(n) = 4,...

In an AP, if d = -4, n = 7 and `a_(n)` = 4, then a is equal to

A

6

B

7

C

20

D

28

Text Solution

Verified by Experts

The correct Answer is:
D
In an AP, ` a_(n)=a+(n-1)d`
`implies 4=a+(7-1)(-4) " " `[by given conditions]
`implies4=a+6(-4)`
`implies 4+24=a`
`:. " " a=28`
Promotional Banner

Topper's Solved these Questions

  • AREAS RELATED TO CIRCLE

    NCERT EXEMPLAR|Exercise Long Answer Type Questions|3 Videos

  • CIRCLES

    NCERT EXEMPLAR|Exercise Circles|44 Videos

Similar Questions

Explore conceptually related problems

In an AP, if a = 1 , a_(n)= 20 and S_(n) = 399 , then n is equal to

In an AP, if a = 3.5 , d = 0 and n = 101 , then a_(n) will be

In an AP,If a =-10,n=6 and a_(n)=10, then find the value of d.

In an A.P., If a=21 , d=-3 and a_(n)=0 , then find the value of 'n' .

In an A.P., if a = 8,a_(4), = 17, S_(n) = 148 then value of n is.

In an AP if d=4,n=7,a_(n)=4 then a is

In an A.P., if a = 3.5, d = 0, n = 101, then find the value of a_(n) .

In an A.P: given a_(n) = 4 , d = 2 , S_(n) = -14 , find n and a .

In an A.P: given a = 5 , d = 3, a_(n) = 50 , find n and S_(n)

In an A.P: given a = 2 , d = 8 , S_(n)= 90 , find n and a_(n) .

NCERT EXEMPLAR-ARITHMETIC PROGRESSIONS-Arithmetic Progressions
  1. In an AP, if d = -4, n = 7 and a(n) = 4, then a is equal to

    Text Solution

    |

  2. In an AP, if a = 3.5, d = 0 and n = 101, then a(n) will be

    Text Solution

    |

  3. The list of number -10, -6, -2, 2, … is

    Text Solution

    |

  4. The 11th term of an AP -5, (-5)/(2), 0, (5)/(2), …

    Text Solution

    |

  5. The first four terms of an A.P. whose first term is -2 and the common ...

    Text Solution

    |

  6. The 21st term of an AP whose first two terms are -3 and 4, is

    Text Solution

    |

  7. If the 2nd term of an AP is 13 and 5th term is 25, what is its 7th ter...

    Text Solution

    |

  8. Which term of an AP : 21, 42, 63, 84, … is 210 ?

    Text Solution

    |

  9. If the common difference of an AP is 5, then what is a(18)-a(13) ?

    Text Solution

    |

  10. What is the common difference of an AP in which a(18)-a(14)=32?

    Text Solution

    |

  11. Two APs have the same common difference. The first term of one of the...

    Text Solution

    |

  12. If 7 times the 7th term of an AP is equal to 11 times its 11th term, t...

    Text Solution

    |

  13. The 4th term from the end of an AP -11, -8, -5, …, 49 is

    Text Solution

    |

  14. The famous mathematician associated with finding the sum of the first ...

    Text Solution

    |

  15. If the first term of an AP is -5 and the common difference is 2, then ...

    Text Solution

    |

  16. The sum of first 16 terms of the AP 10, 6, 2, … is

    Text Solution

    |

  17. In an AP, if a = 1, a(n)= 20 and S(n) = 399, then n is equal to

    Text Solution

    |

  18. The sum of first five multiples of 3 is

    Text Solution

    |

  19. Which of the following form of an AP ? Justify Your answer. (i) -1,-...

    Text Solution

    |

  20. Justify whether it is true to say that -1, (-3)/(2), -2, (5)/(2), … ...

    Text Solution

    |