Nth Term Of An Ap

The common term of the series

is ______

The mean and variance of 7 observations are 8 and 16 respectively If one observation 14 is omitted and and are respectively mean and variance of remaining 6 observation, then is equal to ______

Let be in A.P., and be in G.P. If the sum of first 20 terms of an A.P., whose first term is ​ and the common difference is ​ is −444, then abc is equal to:

Let and be in AP, and and be in GP If the sum of first 20 terms of an AP, whose first term is and the common difference is is , then is equal to: