NDA | Mathematics | AP

Find the sum of n term of AP whose nth term is 6n + 1?

If the arithmetic mean of two numbers a and b, is five times their geometric mean, then  is equal to:

The product of three number in an AP is 224. If the largest number is 7 times the smallest. Find the middle number.

Three positive numbers whose sum is 21 are in arithmetic progression, if 2, 2, 14 are in them added to them respectively then resulting numbers are in geometric progression. which of the following is not among the three numbers

If the sum of n term of an AP is  and its  term is 301. find the value of m