Consider the expression (a + b)n. according to the binomial theorem, the kth term in the expanded form of this expression (where k≤ n) is a) c(n, k)*xkyn-k b) c(n, k-1)*xkyn-k c) c(n-1, k)*xkyn-k d) c(n-1, k-1)*xkyn-k

The Given expression is

There are (n+1) terms in above expression.

To find the k-th term in the expression , we will evaluate (k+1)-th term.

⇒If the expression is of the form,

Then k-th term is given by

Option A

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is: