Question

这只是个例子.问：如何用电脑或是科学计算器,算出来?怎么操作?

Answer 1

若用matlab

设a(k)=C(n,k)*(p^k)*(q^(n-k)), s(k)=a(1)+a(2)+…+a(k)

coef = 1;

ak1 = 1;

ak2 = q^n;

step = k;

s = 0;

for i = 1 : step

coef = (step-i+1)/i * step;

ak1 = ak1 * p;

ak2 = ak2 / q;

ak = coef * ak1 * ak2;

s = s + ak;

end

fprintf(‘a(1)+a(2)+…+a(k)= %fn’, s);