Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

Which recursive sequence would produce the sequence 
3,13,63,dots ?

a_(1)=3 and 
a_(n)=5a_(n-1)-2

a_(1)=3 and 
a_(n)=-5a_(n-1)+6

a_(1)=3 and 
a_(n)=-2a_(n-1)+5

a_(1)=3 and 
a_(n)=6a_(n-1)-5

Which recursive sequence would produce the sequence 3,13,63, 3,13,63, \ldots ?\newlinea1=3 a_{1}=3 and an=5an12 a_{n}=5 a_{n-1}-2 \newlinea1=3 a_{1}=3 and an=5an1+6 a_{n}=-5 a_{n-1}+6 \newlinea1=3 a_{1}=3 and an=2an1+5 a_{n}=-2 a_{n-1}+5 \newlinea1=3 a_{1}=3 and an=6an15 a_{n}=6 a_{n-1}-5

Full solution

Q. Which recursive sequence would produce the sequence 3,13,63, 3,13,63, \ldots ?\newlinea1=3 a_{1}=3 and an=5an12 a_{n}=5 a_{n-1}-2 \newlinea1=3 a_{1}=3 and an=5an1+6 a_{n}=-5 a_{n-1}+6 \newlinea1=3 a_{1}=3 and an=2an1+5 a_{n}=-2 a_{n-1}+5 \newlinea1=3 a_{1}=3 and an=6an15 a_{n}=6 a_{n-1}-5
  1. Test First Option: Let's start by testing the first option:\newlinea1=3a_{1}=3 and an=5an12a_{n}=5a_{n-1}-2\newlineWe know the first term a1a_{1} is 33. Let's find the second term a2a_{2} using the recursive formula.\newlinea2=5a12=5×32=152=13a_{2} = 5a_{1} - 2 = 5\times3 - 2 = 15 - 2 = 13\newlineThis matches the second term of the given sequence.
  2. Find Second Term: Now let's find the third term a3a_{3} using the same recursive formula.\newlinea3=5a22=5×132=652=63a_{3} = 5a_{2} - 2 = 5\times13 - 2 = 65 - 2 = 63\newlineThis matches the third term of the given sequence.
  3. Find Third Term: Since the first three terms of the sequence match the given sequence using the first recursive formula, we can conclude that the correct recursive sequence is:\newlinea1=3a_{1}=3 and an=5an12a_{n}=5a_{n-1}-2

More problems from Identify arithmetic and geometric series