USPS Error Detection Test Number Sequence Comparison Questions and Answers

Question 1

Compare the following two number sequences. How many digits are different?

Sequence 1: 837492015
Sequence 2: 837492105

Accepted Answer

Two

Answer

The sequences are identical except for the 7th and 8th digits, which have been transposed ('01' vs '10'). This results in two differing digits.

Question 2

Which of the following pairs of 9-digit ZIP codes contains exactly one error?

Accepted Answer

781239987 and 781239887

Answer

In the second pair, the seventh digit is a '9' in the first number and an '8' in the second. All other digits match. The first pair has zero errors, and the last two pairs each have two errors.

Question 3

A mail sorting machine reads a package ID as '42033101993458'. The number manually entered for verification is '42033101939458'. How many digits are in error?

Accepted Answer

Two

Answer

Comparing the two sequences, the 10th digit ('9' vs '3') and the 11th digit ('3' vs '9') are different. This constitutes two errors.

Question 4

Identify the number of errors between this pair of 11-digit reference numbers: 55487961230 and 55487961230.

Accepted Answer

None

Answer

Every digit in the first number sequence perfectly matches the corresponding digit in the second number sequence. Therefore, there are no errors.

Question 5

During a manual audit, a clerk compares an address label's tracking number with the system record. Which of the following pairs shows the most differences?

Label vs. System Record

Accepted Answer

345678901 vs 354768901

Answer

The third pair (345678901 vs 354768901) has four mismatched digits. The first pair has zero, the second has two, and the fourth has one. Therefore, the third pair has the most errors.

USPS Error Detection Test Practice Test

USPS Error Detection Test Practice Test

USPS Error Detection Test Number Sequence Comparison Questions and Answers