bai 4

def merge2array(arr1,arr2):
    arr3 = np.empty((arr1.size+arr2.size),dtype=str)
    arr3[0::2] = arr1
    arr3[1::2] = arr2
    print(arr3)

a = np.array([1,3,5,6])
b = np.array(["a","b","c","d"])

merge2array(a,b)