Arithmetic Progressions

The second term of an arithmetic progression I four times the fits term, and the first term is ten.
Find the common difference and hence find the sum of the first 12 terms.

  1. 👍 0
  2. 👎 0
  3. 👁 419
  1. a+d = 4a
    a = 10

    10+d = 40
    d = 30

    S12 = 12/2 (2*10 + 11*30)

    1. 👍 0
    2. 👎 1
  2. The sum of the 3rd and 7th term of an AP is 38 and the 9th term is 37.find the AP

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. sequences and Series

    If 5 times the 5th term is equal to the 6 times the 6th term of an arithmetic sequence then its 11th term is.......

  2. math

    if the sixth term of an arithmetic progression is 37 and sum of the first six term is 147

  3. Math

    In an arithmetic progression, the 5th term is six times the 1st term and the sum of the first six terms is 99. Find the 1st term and the common difference. Attempt at solution: U5 = 6(U1) 99 = 3(2[U1] + 2d)

  4. Utech

    The 9th term of an Arithmetic Progression is 8 and the 4th term is 20. Find the first term and the common difference.

  1. math

    The first term of an arithmetic sequence is 2.The 12th term in the progression is 9 times bigger than the 2nd term. Find the common difference d.

  2. maths

    the sum of first 8 terms of an arithmetic progression is 156.the ratio of its 12th term to its 68th term is 1:5.calculate the first term and the fifteenth term. please help this questions please.

  3. Arithmetic Sequence

    Given the third term of an arithmetic sequence less than the fourth term by three. The seventh term is two times the fifth term. Find the common difference and the first term.

  4. Math

    The fifth term of an arithmetic progression is three times the second term,and the third term is 10.a)What is the first term,b)the common difference and c)the 15th term?

  1. Maths

    if the sum of the 6th and 7th term of an Arithmetic progression(AP) is 60 and the 3rd term is -5 find the common difference?

  2. mathematics

    A goemetric progression is such that the 3rd term is 9times the first term ,while the 2nd term is one-twenty fourth of the 5th term.Find the 4th term

  3. Maths

    A Geometric progression X has a first term of 4a and its sixth term is 256. Another Geometric progression Y has a first term of 3a and its fifth term is 48. Find the: (i) First term of X (ii) Sum of the first four terms of X

  4. Math

    a geometric progression has a third term of 20 and a sum to infinity which is three times the first term. find the first term

You can view more similar questions or ask a new question.