7th v/s 8th Competition

In a sports competition the position of one of the players is 8th from the top and 84th from the bottom. What is the total number of the competitors ?

Every fourth letter from left to right of the English alphabet is dropped. Find 7th, 12th, 17th, 25th and 8th letters from the left of the new series obtained.

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In a row of people Manu is 7th from bottom end of row. Shrey is 10 ranks above Manu. If Shrey is 8th from top, then how many people are there in this row?

If the 6th,7th, 8th terms in the expansion of (x+y)^(n) be 112,7 and 1/4 find x,y and n.

If 6th , 7th , 8th, and 9th terms of (x+ y)^n are a,b,c and d respectively , then prove that : (b^2 - ac)/(c^2 -bd) =4/3. a/c

How many letters are there between 8th letter from left and 7th letter from right in the English alphabet?