Hard
Find the missing group of letters: HEJ, LGN, ___, TKV, XMZ
Explanation
Explanation
Look at each position across the groups. 1st letters: H, L, _, T, X each jump by 4 (H to L to P to T to X), so the missing 1st letter is P. 2nd letters: E, G, _, K, M each jump by 2 (E to G to I to K to M), so the missing 2nd letter is I. 3rd letters: J, N, _, V, Z each jump by 4 (J to N to R to V to Z), so the missing 3rd letter is R. Together this gives PIR.
PRO TIP
Re-check your working by substituting the answer back into the original question.