Here it is × 1 + 1, × 2 + 2, × 3 + 3,... So, the last one will be: 445 × 6 + 6 = 2676 Now find the relation between the first letters. Z..X.VT..RP.. It will be “N” (pattern of decreasing 2) Similarly, the last letter is A, D, G, J.., that is, increasing in a pattern of 2.