Mathematics

An expression contains 26 terms, one for each letter of the alphabet. It starts
a + 4b + 9c + 16d + 25e + … Another expression containing 26 terms starts a + 2b + 4c + 8d + 16e + … What is the sum of all
the coefficients?

  1. 👍
  2. 👎
  3. 👁
  1. the coefficients are just powers of 2, a geometric sequence.
    Sn = a(2^n -1)/(2-1)

    1. 👍
    2. 👎
    👤
    oobleck

Respond to this Question

First Name

Your Response

Similar Questions

  1. LA PLEASE HELP!!!!!!

    Part A In phantom of the tollbooth Act 1, Azaz gives milo a box of letter of the alphabet to... A. can eat them when hes hungry B. will win against the mathemagician C. will learn to be a better reader D.will be protected on his

  2. Math

    Each letter of the English alphabet is written on a scrap piece of paper and put in a hat. P(j) What type of probability is Illustrated and why.

  3. math

    each letter of the alphabet is placed in a bag. One letter is drawn and not replaced. If three letters are drawn without replacement, what is the probability that all three letters chosen are NOT any of the five vowels, a, e, i,

  4. Precalculus

    A skier skis along a circular ski trail that has a radius of 1.3 km. The skier starts at the East side of the ski trail and travels in the CW (clockwise) direction. Let θ represent the varying number of radians the skier has

  1. Discrete Math

    A special type of password consists of four different letters of the alphabet, where each letter is used only once. How many different possible passwords are there?

  2. Math

    A letter is chosen randomly from the 26 letters in the alphabet. Find the probability of choosing a consonant.

  3. maths

    A letter is picked at random from the English alphabet. Find the probability that the letter : a) Appears in the word GEOMETRY

  4. Statistics

    Selecting a letter of the alphabet: If 3 letters of the alphabet are selected at random, find the probability of getting at least one letter "x". Letters can be used more than once. My answer was: P(at least 1 "x) = 1 - (25/26)^3

  1. Math

    Find the probability. You roll two odd numbers and pick a vowel ( when you roll two number cubes and pick a letter of the alphabet at random)

  2. Algebra check answers

    Choose the best definition for the following term: variable A. A letter that holds the place for some unknown value in mathematics*** B. A process where you must look for terms that have identical variable parts and then combine

  3. sign language

    can someone help me with sign language please!! 1)_____ of the American Manual Alphabet hand-shapes are formed to resemble the letter they represent A)All B)some C)None 2)what are two main parts of forming signs? A) forming words

  4. English

    Part A In phantom of the tollbooth Act 1, Azaz gives milo a box of letter of the alphabet to... A. can eat them when hes hungry B. will win against the mathemagician C. will learn to be a better reader D.will be protected on his

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