सदिश का योगफल ज्ञात कीजिए।
सदिश a = i - 2j + k, b = 2i + 4j + 5k और c = i - 6j - 7k
vector a = i - 2j + k, vector b = -2 + 4j + 5k and vector c = i - 6j - 7k,
vector (a + b + c) = 0i - 4j - k = 4i - k
