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ASHA 777 [7]
3 years ago
5

30 points!!!!!!!!!!!!

Mathematics
1 answer:
Marysya12 [62]3 years ago
8 0

Answer:

5

Step-by-step explanation:

an = an_(n - 1) - 5

a2 = a1 - 5

a2 = 20 - 5

a2 = 15

===========

a3 = a2 - 5

a3 = 15 - 5

a3 = 10

============

a4 = a3 - 5

a4 = 10 - 5

a4 = 5

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