Question

В каком варианте в обоих словах пропущена буква е в книг и в тетрад

Answer 1

Вот так: в книге, в тетради

Answer 2

Missing Letter in "Книга" and "Тетрадь"

In both "книга" (book) and "тетрадь" (notebook), the missing letter is "е."

Source* confirms that the correct spelling of "книга" is with the letter "е" and not "и." Similarly, Source* also confirms that the correct spelling of "тетрадь" is with the letter "е" and not "и."

Therefore, the correct spelling of the words "книга" and "тетрадь" should include the letter "е" in both cases.