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The average of 8 numbers is 20, that of the first two is 15.5 and that of the next three is 21frac(1)(3) , the 6th is less than the 7th by 4 and 7 less than the 8th. The last number is

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Priyank ranks 6th from the bottom and 28th from the top in a class. How many students are there in the class?

The coefficient of 5th, 6th and 7th terms in the expansion of (1+x)^n are in A.P. Find the value of n.

If the coefficient of 5^(th) and 3^(rd) terms in the expansion of (sqrt(15/2)x + 1/x^2)^n where n in NN are equal, then the term independent of x is (A) 5th (B) 4th (C) 6th (D) 7th

The sum of the 4th and 8th terms of an AP is 24 and the sum of its 6th and 10th terms is 44. Find the first terms of the AP.