What is the term that can replace the question mark (?)

7Y7, 14X9, 23W11, 34V13, 47U15, ? , 79S19

Given: 7Y7, 14X9, 23W11, 34V13, 47U15, ? , 79S19

Logic: First number follows +7, +9, +11, +13, +15, +17, letters follow (-1) sequence and last number follows +2 sequence (7, 9, 11, 13, 15, 17, 19).

First Number Pattern:
7 + 7 = 14
14 + 9 = 23
23 + 11 = 34
34 + 13 = 47
47 + 15 = 62
62 + 17 = 79
Letter Pattern:
Y - 1 = X
X - 1 = W
W - 1 = V
V - 1 = U
U - 1 = T
T - 1 = S
Last Number Pattern:
7 + 2 = 9
9 + 2 = 11
11 + 2 = 13
13 + 2 = 15
15 + 2 = 17
17 + 2 = 19

So, The Missing Number = 62T17​
Thus, the Correct option is (a) 62T17