Find the letter to be placed in place of ‘?’ in the figure given.
M
N
Q
R
3 + 4 + 5 = 12 ≡L
9 + 6 + 4 = 19 ≡S
7 + 1 + 8 = 16 ≡P
ι . ε . 8 + 3 + 2 = 13 ≡ M