If in a certain language SISTER is coded as 535301 , UNCLE is coded as 84670 and BOY as 129 , how son is coded ?

Answer: Option B

we have, S = 5
I = 3
T = 3
E = 0
R = 1
U = 8
N = 4
C = 6
L = 7
B = 1
O = 2
Y = 9.
So,
SON = 524.