English listening. arrange the sentence#shorts

In how many can the lettes in English alphabet be arranged, so that there are 7 letters between the letters a and b.

In how many ways can the letters of the English alphabet be arranged so that there are seven letters between the letters A and B ?

Identify the segment in the sentence. Which contain the grammatical error. If the sentence has no error then select 'no error'. Sh! Someone listens to our conversation.

Identify the segment in the sentence. Which contain the grammatical error. Nobody has ever listened to me so attentive

In the following questions, a sentence/ part of the sentence is printed in bold. Below are given alternatives to the bold sentence/part of the sentence which may improve the sentence. Choose the correct alternative. In case no improvement is needed, your answer is No Improvement. Listen attention to what I say

Arrange the following words as per the English dictionary and find the last word. Leaf Less last word.