If the ratio of the total number of combinations of `2n` different things to the total number of combinations of n different things is `1025: 1`, find n.

If the ratio of the total number of combinations of 2n different things to the total number of combinations of n different things be 1025 : 1 , find n .

What is the total number of combination of n different things taken 1, 2, 3,...,n at a time ?

Show that in the number of combinations of 2n different things taken n at a time , the number of combinations in which a particular thing occurs , is equal to the number in which it does not occur .

If the number of combinations of n different things taken (r+r) at a time be equal to the number of combinations taken (r-r) at a time , find the value of n.

The number of combinations of n different things taken r at a time in which p particular things always occur is -

Important note (2n) || Total number OF combinations || Acidic results