Answer:
George Miller's magic number 7 plus or minus 2
Step-by-step explanation:
The magic number 7 plus or minus 2 refers to a theory proposed by George Miller in 1956 in which he stated that the number of items that a person can keep in the short term memory is 7 ± 2 because we only have some slots in which we can maintain the information. According to this, when Jamal tries to repeat the numbers in the credit card but can't remember all of them, he is coming gainst George Miller's magic number 7 plus or minus 2.