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In how many ways can 6 subjects be selected from 10 subjects for an examination?

• A. 218
• B. 216
• C. 215
• D. 210

QUICK ANSWER…

D

SOLUTION…  

Please observe that this problem did not require we do the selection in a specific order,

Hence:

Now for the right answer to the above question:

1. Option A is incorrect.
2. Option B is incorrect.
3. C is incorrect.
4. D is the correct answer.

QUICK TIPS…

You may please note these/this:

• Selecting a few numbers out of many numbers requires permutation or combination depending on if the order of selection is under consideration or not.
• When the order of selection is under consideration, permutation will be done, but when the order of selection does not matter, combination will be done.

Use the questions and answers session to deal further on this question…

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/ culled from 2018 JAMB-UTME mathematics question 26 /