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Babynini
 one year ago
The 20th term of an arithmetic sequence is 101, and the common difference is 3. Find a formula for the nth term.
Babynini
 one year ago
The 20th term of an arithmetic sequence is 101, and the common difference is 3. Find a formula for the nth term.

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Babynini
 one year ago
Best ResponseYou've already chosen the best response.1@ganeshie8 are you free? :)

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1hrm, from the info given I have a_20=a+(201)d a_20=a+(19)*3 a_20=a+57 yeah?

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1we know a_20 so it comes to 101=a+19(3) a=44 so the formula for the nth term will be a_n=44+(n1)(3) ?

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1You've put a lot of work into this already, so let's test your equation to verify it.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Testing a_20 seems like a good idea. Do we get the right answer?

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Looks like you've got it. Congrats!

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1thanks for checking ^^ (how did you test a_20?)

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Just plugged in n = 20.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1I hoped it would be 101 as the answer, and it was.

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1oh haha I see. Fabulous.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Of course, I needed to see that n = 1 gave me 44 as claimed, but that was kind of obvious since that's what you built the formula to do. :)
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