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Bunuel
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Option C)

Students who Touch-type (TT) = 10

Other 15 can use word processing program (WPP) - means: Either this group includes the number of students who can use both TT & WPP Or other group (i.e., Students who Touch-type (TT) = 10) includes the number of students who can use both TT & WPP.

Total number of students = Number of students who can only TT + Number of students who can only use WPP + Number of students who can use Both + Number of students who can use Neither

Number of students who can only TT + Number of students who can use only WPP + Number of students who can use Both = 10 + 15 = 25

Hence, Total number of students = 25 + 13 = 38
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Bunuel
Ten students in a computer skills company can touch-type and the other 15 can use a particular word processing program. If 13 of the students can neither use the program nor touch-type, then how many students are in the class?

A. 19
B. 34
C. 38
D. 42
E. 46

Since, nothing is mentioned about students having both the skills(touch-type & word processing program), we will take it as zero.
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... and the other 15 suggests that the 2 groups are mutually exclusive, hence, both = 0

Bunuel
Ten students in a computer skills company can touch-type and the other 15 can use a particular word processing program. If 13 of the students can neither use the program nor touch-type, then how many students are in the class?

A. 19
B. 34
C. 38
D. 42
E. 46
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