Write a function to calculate the binomial coefficient for the given value of n and k.
This formula is recommended:
$\binom{n}{k} = \frac{n!}{(n-k)!k!} = \frac{n(n-1)(n-2)\ldots(n-k+1)}{k(k-1)(k-2)\ldots 1}$binom
is a function.
testString: assert(typeof binom === 'function', 'binom
is a function.');
- text: binom(5,3)
should return 10.
testString: assert.equal(binom(5, 3), 10, 'binom(5,3)
should return 10.');
- text: binom(7,2)
should return 21.
testString: assert.equal(binom(7, 2), 21, 'binom(7,2)
should return 21.');
- text: binom(10,4)
should return 210.
testString: assert.equal(binom(10, 4), 210, 'binom(10,4)
should return 210.');
- text: binom(6,1)
should return 6.
testString: assert.equal(binom(6, 1), 6, 'binom(6,1)
should return 6.');
- text: binom(12,8)
should return 495.
testString: assert.equal(binom(12, 8), 495, 'binom(12,8)
should return 495.');
```