か否いなか

expression

whether or not

A formal written expression used to embed a yes/no question inside a sentence. Often follows a plain-form clause. In spoken Japanese, ～かどうか is more common.

• その情じょう報ほうが正ただしいか否いなかはまだ分わからない。

  We still don't know whether or not that information is correct.

• 参さん加かするか否いなかを早はやめにお知しらせください。

  Please let us know whether or not you will attend as soon as possible.