Form a sequence that has two arithmetic means between 13 and 88.

Let x and y be the two arithmetic means between 13 and 88. So the complete sequence will be:

13, x, y, 88

First term of sequence = 
Fourth term of sequence = 



Using the value of  and , we can calculate the value of d which is the common difference of the series.



Therefore, the common difference of the sequence will be 25.

x is the second term of the sequence.
So, x = 

And,
y = 

Therefore, the first four terms of the sequence will be:

13, 38, 63, 88