In a survey of a TriDelta chapter with 42 members, 17 were taking mathematics, 30 were taking English, and 9 were taking both. How many were not taking either of these subjects?

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To find the number of members who were not taking either mathematics or English, we need to subtract the number of members who were taking either mathematics or English from the total number of members in the TriDelta chapter.

We are given:
Total number of members = 42
Number of members taking mathematics = 17
Number of members taking English = 30
Number of members taking both mathematics and English = 9

To find the number of members who were taking either mathematics or English, we can add the number of members taking mathematics to the number of members taking English and then subtract the number of members taking both mathematics and English (to avoid double counting).

Number of members taking either mathematics or English = Number of members taking mathematics + Number of members taking English - Number of members taking both mathematics and English

Plugging in the given values:
Number of members taking either mathematics or English = 17 + 30 - 9
Number of members taking either mathematics or English = 38

Finally, to find the number of members who were not taking either mathematics or English, we subtract the number of members taking either mathematics or English from the total number of members:

Number of members not taking either mathematics or English = Total number of members - Number of members taking either mathematics or English
Number of members not taking either mathematics or English = 42 - 38
Number of members not taking either mathematics or English = 4

Therefore, there were 4 members who were not taking either mathematics or English.