math
posted by theresa .
90,40,15. What is the next number in the pattern and what is the rule for the pattern

a(n+1)=a(n)/2 5
a1=90
a2=90/2 5= 455= 40
a3=40/2 5= 205= 15
a4=15/2 5= 7.55= 2.5
The next number is 2.5
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