Answer:
c 2 1/2
Step-by-step explanation:
Answer:
2,3 3 5
Step-by-step explanation:
The sequence is arithmetic since the common difference that is equal
d=11-15=7-11=-4
a(n) = a1 +(n-1)d
a1=15
=
a(n) = 15+(n-1)-4




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