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Series is both singular and plural. It depends on the sense, it takes a singular verb when it has a sense of "one set", even though it's followed by a plural of-phrase

A series of lectures is scheduled

In the 1st and 2nd examples, it refers to one or more sets of series. But for the third sentence, it can be interpreted as a singular or plural noun, depending on the context.

The TV is optional because it can be understood from the context.


Reference

American Heritage Guide to Contemporary Usage and Style

Series is both singular and plural. It depends on the sense, it takes singular verb when it has a sense of "one set", even though it's followed by a plural of-phrase

A series of lectures is scheduled

In the 1st and 2nd examples, it refers to one or more sets of series. But for the third sentence, it can be interpreted as singular or plural, depending on context.

The TV is optional because it can be understood from the context.


Reference

American Heritage Guide to Contemporary Usage and Style

Series is both singular and plural. It depends on the sense, it takes a singular verb when it has a sense of "one set", even though it's followed by a plural of-phrase

A series of lectures is scheduled

In the 1st and 2nd examples, it refers to one or more sets of series. But for the third sentence, it can be interpreted as a singular or plural noun, depending on the context.

The TV is optional because it can be understood from the context.


Reference

American Heritage Guide to Contemporary Usage and Style

1
source | link

Series is both singular and plural. It depends on the sense, it takes singular verb when it has a sense of "one set", even though it's followed by a plural of-phrase

A series of lectures is scheduled

In the 1st and 2nd examples, it refers to one or more sets of series. But for the third sentence, it can be interpreted as singular or plural, depending on context.

The TV is optional because it can be understood from the context.


Reference

American Heritage Guide to Contemporary Usage and Style