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crimeas [40]
3 years ago
15

:( I really need help..

Mathematics
1 answer:
Harman [31]3 years ago
5 0

Answer:

option d) a(n)=4(n-1)+\frac{3}{4}

step by step explanation:

Given sequence is a_n={4, \frac{19}{4},\frac{11}{2},\frac{25}{4},7,...}

Let a_1=4,  a_2=\frac{19}{4}, a_3=\frac{11}{2}, a_4=\frac{25}{4},a_5=4, ...

common difference d=a_2-a_1

                                 d=\frac{19}{4}-4  

                                 d=\frac{19-16}{4}

                                 d=\frac{3}{4}  

                                 d=a_3-a_2

                                 d=\frac{11}{2}-\frac{19}{4}  

                                 d=\frac{22-19}{4}

                                 d=\frac{3}{4}                                                                          

Therefore the common difference  d=\frac{3}{4}    

The recurrsive formula for arithmetic sequence is

a(n)=a(n-1)+d

Therefore

a(n)=4(n-1)+\frac{3}{4} where a=4 and d=\frac{3}{4}

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