Find the sum of the geometric series given a1=6,an=18750

X s://app.gradally.com/my-classes/4239004/8881fe772fd84141b8f77e5548e57b45 Target due 18. Find the sum, Sx, of the geometric series given @1= 6, 4x - 18750 , and r = 5. Remember to use the formula Sx = a1-ax" 1 -r O Su = 23436 S, = 3906 O Sx = 3750 O Sx = -93749 O DESCRIPTION 18 of 20 > M C