Tokens

The non-transparent bags contain red, white, yellow, and blue tokens. We pulled one token three times and returned it again, writing down all possibilities.

Correct answer:

n =  64

Step-by-step explanation:

$$\begin{gathered} AAA \\ AAA \\ AAA \\ AAA \\ AAB \\ AAB \\ AAB \\ AAB \\ AAC \\ AAC \\ AAC \\ AAC \\ AAD \\ AAD \\ AAD \\ AAD \\ ABA \\ ABA \\ ABA \\ ABA \\ ABB \\ ABB \\ ABB \\ ABB \\ ABC \\ ABC \\ ABC \\ ABC \\ ABD \\ ABD \\ ABD \\ ABD \\ ACA \\ ACA \\ ACA \\ ACA \\ ACB \\ ACB \\ ACB \\ ACB \\ ACC \\ ACC \\ ACC \\ ACC \\ ACD \\ ACD \\ ACD \\ ACD \\ ADA \\ ADA \\ ADA \\ ADA \\ ADB \\ ADB \\ ADB \\ ADB \\ ADC \\ ADC \\ ADC \\ ADC \\ ADD \\ ADD \\ ADD \\ ADD \\ BAA \\ BAA \\ BAA \\ BAA \\ BAB \\ BAB \\ BAB \\ BAB \\ BAC \\ BAC \\ BAC \\ BAC \\ BAD \\ BAD \\ BAD \\ BAD \\ BBA \\ BBA \\ BBA \\ BBA \\ BBB \\ BBB \\ BBB \\ BBB \\ BBC \\ BBC \\ BBC \\ BBC \\ BBD \\ BBD \\ BBD \\ BBD \\ BCA \\ BCA \\ BCA \\ BCA \\ BCB \\ BCB \\ BCB \\ BCB \\ BCC \\ BCC \\ BCC \\ BCC \\ BCD \\ BCD \\ BCD \\ BCD \\ BDA \\ BDA \\ BDA \\ BDA \\ BDB \\ BDB \\ BDB \\ BDB \\ BDC \\ BDC \\ BDC \\ BDC \\ BDD \\ BDD \\ BDD \\ BDD \\ CAA \\ CAA \\ CAA \\ CAA \\ CAB \\ CAB \\ CAB \\ CAB \\ CAC \\ CAC \\ CAC \\ CAC \\ CAD \\ CAD \\ CAD \\ CAD \\ CBA \\ CBA \\ CBA \\ CBA \\ CBB \\ CBB \\ CBB \\ CBB \\ CBC \\ CBC \\ CBC \\ CBC \\ CBD \\ CBD \\ CBD \\ CBD \\ CCA \\ CCA \\ CCA \\ CCA \\ CCB \\ CCB \\ CCB \\ CCB \\ CCC \\ CCC \\ CCC \\ CCC \\ CCD \\ CCD \\ CCD \\ CCD \\ CDA \\ CDA \\ CDA \\ CDA \\ CDB \\ CDB \\ CDB \\ CDB \\ CDC \\ CDC \\ CDC \\ CDC \\ CDD \\ CDD \\ CDD \\ CDD \\ DAA \\ DAA \\ DAA \\ DAA \\ DAB \\ DAB \\ DAB \\ DAB \\ DAC \\ DAC \\ DAC \\ DAC \\ DAD \\ DAD \\ DAD \\ DAD \\ DBA \\ DBA \\ DBA \\ DBA \\ DBB \\ DBB \\ DBB \\ DBB \\ DBC \\ DBC \\ DBC \\ DBC \\ DBD \\ DBD \\ DBD \\ DBD \\ DCA \\ DCA \\ DCA \\ DCA \\ DCB \\ DCB \\ DCB \\ DCB \\ DCC \\ DCC \\ DCC \\ DCC \\ DCD \\ DCD \\ DCD \\ DCD \\ DDA \\ DDA \\ DDA \\ DDA \\ DDB \\ DDB \\ DDB \\ DDB \\ DDC \\ DDC \\ DDC \\ DDC \\ DDD \\ DDD \\ DDD \\ DDD \\ n=4^3=64 \end{gathered}$$

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