Q. If FRANCE is coded as 654321 and GERMANY is coded as 9158437, then how is YEMEN coded?

Explanation : 

1. From “FRANCE → 654321” we get a letter→digit mapping:
F→6, R→5, A→4, N→3, C→2, E→1

2. From “GERMANY → 9158437” the same mapping must hold for letters already seen, and it tells us the new letters’ codes:
G→9, E→1 (matches), R→5, M→8, A→4, N→3, Y→7

3. Now code “YEMEN” by replacing each letter with its digit:
Y → 7
E → 1
M → 8
E → 1
N → 3

So YEMEN → 71813

Answer: (d) 71813