What is the 20th term of the following arithmetic sequence?

1/2,1,3/2,2...

Question

What is the 20th term of the following arithmetic sequence? 

1/2,1,3/2,2...

parthkohli · Answer

Common difference is $1 \over 2$

parthkohli · Answer

$\Large \color{purple}{\rightarrow 0 + n({1 \over 2}) }$

Substitute n with 20, and you get the answer.

anonymous · Answer

10?

parthkohli · Answer

Yes!

anonymous · Answer

thanks :)
i need help with these:

4) Find the four arithmetic means between -21 and -36. 

5) Find the four arithmetic means between 100 and 135.

parthkohli · Answer

@clholic Just find the mean of the numbers(let's take mean as x). Then, take the mean of x and -21, also x and -36.

Similar for the second one.

anonymous · Answer

A1 = -21+(-3) = -24
A2 = -24+(-3) = -27
A3 = -27+(-3) = -30
A4=-30+(-3) = -33

parthkohli · Answer

Yes! CORRECT!

anonymous · Answer

okk
Im really Stuck on this :/
Find S^25 for 1/2 + 1 + 3/2 + 2 + ...

hero · Answer

If you started with this observation:

1/2, 2/2, 3/2, 4/2....

You could have quickly realized that 20/2 or 10 was the 20th term of the sequence.

parthkohli · Answer

...how did you even