Find The First Term Of An Arithmetic Sequence If The Common Difference Is Five And Eighteenth Term Is 87
find the first term of an arithmetic sequence if the common difference is five and eighteenth term is 87
Answer:
a1=2
Step-by-step explanation:
a1=?
d=5
an=87
n=18
Arithmethic Sequence
an=a1+(n-1)d
87=a1+(18-1)5
87=a1+85
a1=2
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