Question
Download Solution PDFA random sample of 2 items is picked out from a population of 15 items. The number of all such samples is ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven
Total items = 15
Select = 2
Formula
nCr = n!/r!(n - r)!
Calculation
The number of such samples = 15C2 = 15!/2!(15 - 2)!
⇒ 15 × 14 × 13!/2 × 13!
⇒ 15 × 7 = 105
∴ The number of all such samples is 105.
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