Find the sum of the first 10 terms of the sequence 3+7+13+... (1 Viewer)

[bubbletea4lyfe]

Hello can somebody figure out how to :Find the sum of the first 10 terms of the sequence 3+7+13+...
This question is from the Maths In Focus textbook of y12 Mathematics Adv.
The answer is 2146.
Is there a working out for it

 

[cossine]

Hello can somebody figure out how to :Find the sum of the first 10 terms of the sequence 3+7+13+...
This question is from the Maths In Focus textbook of y12 Mathematics Adv.
The answer is 2146.
Is there a working out for it

Need more terms.

However, it is clear the series is not arithmetic or geometric.

 

[Velocifire]

don't use maths in focus btw

 

[idkkdi]

Hello can somebody figure out how to :Find the sum of the first 10 terms of the sequence 3+7+13+...
This question is from the Maths In Focus textbook of y12 Mathematics Adv.
The answer is 2146.
Is there a working out for it

formula for Tn is (n+1)^2 - n

actually nvm, wrong formula, no way answer is 2146 this way.

another possible formula seems to be every second prime number, but once again that does not work out.

 

[vernburn]

This is a bad question as it is requires a lot of guessing to get the general term.

 

[idkkdi]

This is a bad question as it is requires a lot of guessing to get the general term.

how tf did u guess that term lmao

 

[dan964]

for all I care the sequence could be
3, 7, 13, 17, 23 and so on.

 

[CM_Tutor]

Maybe if the question said that the sequence was the sum of an AP and a GP... or better, if its an AP + a GP where ...