4. License plates in a certain region consist of six characters: the first two are uppercase English letters other than O, and the last four are Arabic numerals from 0 to 9. However, three consecutive 4's are not allowed. For example, AA1234 and AB4434 are valid license plates, while AO1234 and AB3444 are not. The number of license plates with first character A and last character 4 is (1) $25 \times 9 ^ { 3 }$ (2) $25 \times 9 ^ { 2 } \times 10$ (3) $25 \times 900$ (4) $25 \times 990$ (5) $25 \times 999$
& 4 & & 16 & 0 & & 32 & 9
4. License plates in a certain region consist of six characters: the first two are uppercase English letters other than O, and the last four are Arabic numerals from 0 to 9. However, three consecutive 4's are not allowed. For example, AA1234 and AB4434 are valid license plates, while AO1234 and AB3444 are not. The number of license plates with first character A and last character 4 is\\
(1) $25 \times 9 ^ { 3 }$\\
(2) $25 \times 9 ^ { 2 } \times 10$\\
(3) $25 \times 900$\\
(4) $25 \times 990$\\
(5) $25 \times 999$