destinyw9619 destinyw9619
  • 21-01-2018
  • Mathematics
contestada

Write a formula for the sum of the first n integers that are divisible by 3

Respuesta :

dannielle
dannielle dannielle
  • 21-01-2018
3*1+3*2+3*3+,,,+3n= 3*(1+2+...+n)
=3*n(n+1)/2


cause 1+2+...+n=n(n+1)/2
Answer Link

Otras preguntas

Cells differentiate because they need to become specialized. Which is an NOT example below of how specialized cells have unique structure and function. Question
Which sentence has a pronoun-antecedent error? A) Defrauding the general fund and blackmailing your enemies are not ways to be re-elected to public office. B)
What Progressive reform was most successful in reducing the prevalence of child labor in the United States in the early 1900s?
In the figure, a∥b and m∠3 = 34°. What is the m∠7 ?
PLZ HELP HURRY 20 POINT
A) 40 B) 38 C) 24 D) 30
Which revision fixes the mistake in parallel structure in the sentence? Asking for directions is better than to guess which way to go. A) Asking for di
PLEASE HELP ME ITS URGENT
A power that is vested in the president is
Of a squirrels hidden nuts, for every 5 that get found, 3 will never be found . A squirrel hid 40 all together . How many nuts did not get found
ACCESS MORE