Q: 5
A washing machine has three temperature bands for different kinds of fabrics: fragile fabrics are
washed at temperatures between 15 and 30 degrees Celsius; normal fabrics are washed at
temperatures between 31 and 60 degrees Celsius; heavily soiled and tough fabrics are washed at
temperatures between 61 and 100 degrees Celsius.
Which of the following contains only values that are in different equivalence partitions?
Options
Discussion
C/D? 12 in D is outside any defined band, so C is the safer pick for valid partitions.
Why do so many folks consider D? 12's outside all defined ranges, so doesn't fit "different valid partitions" like ISTQB usually expects.
Not totally sure, but I'd pick C. Looks like each number comes from a different valid partition for the temperature bands.
C , since each value (25, 45, 75) belongs to a different valid partition: fragile, normal, and tough fabrics. The others either repeat partitions or include out-of-bounds values (like 12 in D), which ISTQB usually doesn't want. Pretty sure this matches how equivalence classes are supposed to be picked, but if you’ve seen different on real exams let me know.
C not D. 25, 45, 75 each from a unique partition (fragile, normal, tough), saw similar on practice.
D imo since 12, 35, and 55 seem spread out but is the question asking for only valid (in-range) values or can we pick out of bounds? If only partition ranges count then maybe C fits better.
B is the trap with 35 and 60 both in normal, so it's got to be C.
C or B? C matches the classic equivalence partitioning, one value from each valid range (fragile/normal/heavily soiled). B is tempting but 35 and 60 are both in the normal band. Think that's the trap. Pretty sure it's C, but open to arguments.
Why not C? Each number in that option sits in a separate valid partition: 25 for fragile, 45 for normal, 75 for heavily soiled. Curious if anyone thinks partitions include boundary values differently here.
Its B, not C. 20, 35, and 60 feel like they're each from different temperature ranges. I know most go for C but pretty sure there's a trap with boundary values here.
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