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In your office 4 posts have fallen vacant. In how many ways a selection out of 31 candidates can be made if one candidate is always included?
- a)30C4
- b)30C3
- c)31C3
- d)31C4
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
In your office 4 posts have fallen vacant. In how many ways a selectio...
since 1 candidate is already selected so there are 3 posts for which we need candidates from 30.
Most Upvoted Answer
In your office 4 posts have fallen vacant. In how many ways a selectio...
Solution:
Given, one candidate is always included in the selection process.
Out of 31 candidates, one candidate is already selected. So, we need to select the remaining 3 candidates from the remaining 30 candidates.
Therefore, the required number of ways of selecting 3 candidates out of 30 candidates is:
= 30C3
= (30 x 29 x 28)/(3 x 2 x 1)
= 4060
Hence, the correct option is (b) 30C3.
Given, one candidate is always included in the selection process.
Out of 31 candidates, one candidate is already selected. So, we need to select the remaining 3 candidates from the remaining 30 candidates.
Therefore, the required number of ways of selecting 3 candidates out of 30 candidates is:
= 30C3
= (30 x 29 x 28)/(3 x 2 x 1)
= 4060
Hence, the correct option is (b) 30C3.
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Community Answer
In your office 4 posts have fallen vacant. In how many ways a selectio...
If you selected 1 person in 31 than
left members are 30
and place are 3 so
now the selection in 30 person and place is 3 so your answer is
30C3
left members are 30
and place are 3 so
now the selection in 30 person and place is 3 so your answer is
30C3
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In your office 4 posts have fallen vacant. In how many ways a selection out of 31 candidates can be made if one candidate is always included?a)30C4b)30C3c)31C3d)31C4Correct answer is option 'B'. Can you explain this answer?
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