Which of the following is most likely the next step in the series? a4a, b8b, c12c, d16d, . . a. e20e b. e24e c. e24e d. e20e

it is E20e not e20E

so the answer is A

 The correct option is (A) E20e.

Step-by-step explanation:  We are to find the most likely next step in the following series:

A4a,  b8B,  C12c,  d16D,   .   .   ..

The first letters are A, b, C, d,  .  .  .. So, the next letter in this series will be E.

The second numbers are 4, 8, 12, 16,  .  .  ..

That is, 4 × 1, 4 × 2, 4 × 3, 4 × 4, .  .  . . So, the next number in this series will be 4 × 5 = 20.

The third terms are a, B, c, D,  .  .  .. So, the next letter in this series will be e.

Thus, the next step in the given series is

E20e.

Option (A) is CORRECT.

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above

what is the model?

step-by-step explanation: