Find the next term in the series
CAT, EER GIP, __ KUL

1st letters of each term are : C, E, G, ?, K 

We can observe that these are alternate alphabets of english alphabets 

Hence, we can say that the first alphabet of the missing term will be I 

2nd letter of each term are : A, E, I, ?, U 

We can observe that there is gap of exactly 3 alphabets between any 2 consecutive terms. 

Hence we can say that the second alphabet of the missing term will be O

3rd letter of each term are :T, R, P, ?, L 

We can observe that these are alternate alphabets in descending order. 

Hence we can say that the third alphabet of the missing term will be N