Question:
If n is a positive integer, then the number of terms in the expansion of $[x + a]^n$ is
If n is a positive integer, then the number of terms in the expansion of $[x + a]^n$ is
Updated On: Jul 6, 2022
- n
- n + 1
- n + 2
- infinitely many
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The Correct Option is B
Solution and Explanation
n is positive interger, number of terms = n + 1
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Concepts Used:
Binomial Theorem
The binomial theorem formula is used in the expansion of any power of a binomial in the form of a series. The binomial theorem formula is
Properties of Binomial Theorem
- The number of coefficients in the binomial expansion of (x + y)n is equal to (n + 1).
- There are (n+1) terms in the expansion of (x+y)n.
- The first and the last terms are xn and yn respectively.
- From the beginning of the expansion, the powers of x, decrease from n up to 0, and the powers of a, increase from 0 up to n.
- The binomial coefficients in the expansion are arranged in an array, which is called Pascal's triangle. This pattern developed is summed up by the binomial theorem formula.