Sum of 9 terms is 75 and comman difference is 5 find first term
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s9=75, d=5
Sn =n/2{2a+(n-1)d}
75 =9/2{2a+(9-1)5}
75 =9/2{2a+40}
75/2=9{2a+40}
37.5=18a+360
18a =360-37.5
18a =322.5
a =322.5/18
a =17.9166
a =18
first term a=18
Sn =n/2{2a+(n-1)d}
75 =9/2{2a+(9-1)5}
75 =9/2{2a+40}
75/2=9{2a+40}
37.5=18a+360
18a =360-37.5
18a =322.5
a =322.5/18
a =17.9166
a =18
first term a=18
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