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

None

Answer

One

Answer

Three

Question 2

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

Accepted Answer

781239987 and 781239887

Answer

940551020 and 940551020

Answer

455987654 and 455897654

Answer

112358132 and 113258132

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

One

Answer

Three

Answer

None

Question 4

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

Accepted Answer

None

Answer

One

Answer

Two

Answer

Three

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

987654321 vs 987654321

Answer

112233445 vs 112323445

Answer

678901234 vs 678901235

Question 6

A data entry form requires a 10-digit customer ID. The correct ID is '2988457610', but the clerk accidentally enters '2988547610'. This specific error, where two adjacent digits are swapped, is called a transposition. How many numerical errors does a single transposition create?

Accepted Answer

Two

Answer

One

Answer

Four

Answer

It depends on the numbers