the common ratio is 2.5
but how you get the ratio 2.5?
i multiplied the 16 in 2.5.
i try to multiply the 16 in different numbers.
but you have a formula for 2.5?
sir i try to solve a2,a3,a4 using an=a1 r n-1 but the a3 and a4 is not same a3 answer is 160 and the a4 answer is 1080 but when you use simple mutiply like 16x2.5, 40x2.5, 100x2.5, and 250x2.5 you get the correct answer please help me!