In an A.P.IF a=5,d=-2.5an=7.5then find n?
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a=5
d=-2.5
an=a+(n-1)d
7.5=5+[n-1)-2.5
2.5=(n-1)/-2.5
-1=n-1
n=2
d=-2.5
an=a+(n-1)d
7.5=5+[n-1)-2.5
2.5=(n-1)/-2.5
-1=n-1
n=2
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