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Question

How many different vegetables can be made from cauliflower, tomatoes, onions, potatoes and carrots?

The correct answer is
31

Calculate Vegetable Combinations

The problem asks for the number of different ways to combine items selected from a list of 5 distinct vegetables: cauliflower, tomatoes, onions, potatoes, and carrots. This is equivalent to finding the number of non-empty subsets of a set with 5 elements.

We have 5 distinct vegetables. For each vegetable, there are two choices: either include it in the combination or not include it.

Combinations Calculation

When dealing with $n$ distinct items, the total number of possible subsets (including the empty set, where no items are chosen) is given by the formula $2^n$.

Here, the number of distinct vegetables is $n = 5$.

Total possible combinations = $2^n = 2^5$.

Calculating this value:

$2^5 = 2 \times 2 \times 2 \times 2 \times 2 = 32$.

This total includes the combination where no vegetables are chosen (the empty set). Since the question implies making *different* combinations, we need to exclude this one case.

The number of non-empty combinations is calculated as:

Number of non-empty combinations = $2^n - 1$.

Substituting $n=5$:

Number of non-empty combinations = $2^5 - 1 = 32 - 1 = 31$.

Therefore, there are 31 different combinations of vegetables that can be made.

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Important Questions from Permutation and Combination (Notes)

  1. In how many ways can 10 men be divided into two groups of 4 men and 6 men?
  2. How many 5-digit numbers can be formed from the digits 0, 2, 3, 4, 6, 7 and 9, using each at most once, which are divisible by 5?
  3. In how many ways can you place $N$ coins on a board with $N$ rows and $N$ columns such that every row and every column contains exactly one coin?
  4. From a group of 40 players, a cricket team of 11 players is chosen. Then, one of the eleven is chosen as the captain of the team. The total number of ways this can be done is
    [$\binom{m}{n}$ below means the number of ways $n$ objects can be chosen from $m$ objects]
  5. The maximum number of points formed by intersection of all pairs of diagonals of convex octagon is
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