At an election there are 5 candidates and 3 members are to be elected....
Solution:
Given, there are 5 candidates and 3 members are to be elected.
To find: The number of ways a voter can choose to vote.
Approach:
For each candidate, a voter has two choices - either to vote or not to vote.
For 3 members to be elected, a voter can vote for any number of candidates from 0 to 3.
Therefore, the total number of ways a voter can choose to vote is given by the sum of the binomial coefficients of (5,0), (5,1), (5,2), and (5,3).
Calculation:
- (5,0) = 1
- (5,1) = 5
- (5,2) = 10
- (5,3) = 10
Total number of ways = (5,0) + (5,1) + (5,2) + (5,3) = 1 + 5 + 10 + 10 = 26
But, the voter cannot choose to vote for more than 3 candidates, so we need to subtract the case where the voter chooses to vote for all 5 candidates.
Number of ways where the voter chooses to vote for all 5 candidates = (5,3) = 10
Therefore, the actual number of ways a voter can choose to vote is 26 - 10 = 16.
Hence, option (d) none of these is the correct answer.
Final Answer: (d) none of these.
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