solve this equation 2nC2=15 (its a combination)
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Answered by
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Answer
The value of n is 3
Given
To Find
- The value of n
Solution
Now Solving the quadratic equation we will have the value of n
Now we have
And
Since the value of n can never be negative or fraction so n ≠ -5/2
Thus the value of n is 3
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0
Solutions:
²nC2 = 15
(2n)/ (2n)(2n - 2)
2n × (2n - 1) × (2n +2) / 2 × 1 × (2n - 2) = 15
n(2n - 2) = 15
2n² - n - 15 = 0
2n² - 6n + 5n - 15 = 0
2n(n - 3) + 5(n - 3) = 0
(2n + 5) (n - 3) = 0
n - 3 = 0
n = 3
2n + 5 = 0
n = -5/2.
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