Thus, if the equality holds for k,

Thus, if the equality holds for k, it holds for k+1.
Therefore, by mathematical induction, the equality is true for all natural number n

ผลลัพธ์ (อังกฤษ) 2:

Thus, if the equality holds for K, holds for K + 1.
Therefore, by mathematical induction, the equality is true for all n Natural Number.