Question

Which letter will make a meaningful word
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Answer 1

Answer:

If the letter is written for ofiicial purpose then it should be written as formal letter and if it is written to any reletives or for personal letter it should be wriiten as informal letter

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Answer 2

The letter a is not only a letter but also a word.
It is used to describe whether the noun is singular or plural. It the letter ‘a’ is used before a noun, then it mean that the noun is singular