Using binomial theorem, coefficient of x³ in (1+x) 7 is:

📐 Mathematics · Permutations and Combinations · JEE

Using binomial theorem, coefficient of x³ in (1+x)⁷ is:

Answer: 35.

Correct answer: B. 35

Explanation: 7C3 = 35. Coefficient of x^r in (1+x)ⁿ is nCr.

Counting tree for selecting 2 items from {A, B, C} without repetition: 3 x 2 = 6 ordered arrangements.

Counting, arrangements, and selections