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For items 20-21, use the following statement:

I. A sequence where each term after the first is obtained by adding the same constant.
II. A sequence where each term after the first is obtained by multiplying the preceding term by the same constant.
III. A sequence where its first two terms are either both 1, or 0 and 1; and each term, thereafter, is obtained by adding the two preceding terms.  

20. Which of the following statement best describe an arithmetic sequence?      
          
A. I only                     
B. II only                        
C. III only                         
D. none of the above           

21.   Which of the following statement that best describe the sequence 5, -10, 20, -40, 80 ?          
A. I only                     
B. II only                        
C. III only                         
D. none of the above ​


Sagot :

Step-by-step explanation:

pede mo ba yn hulaan?? de jk lng sagot ko jn sa 20. is c tas sa 21.A tama po yn promise kayo na bhala kung ayw nyo maniwala