a. =2. d =5. n =25 then find (Sn )in ap
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Answered by
7
Answer:
formula sn =n/2 (2 a+(n-1)× d )
sn =25 / 2 { (2 ×2 +( 25-1)× 5 }
sn= 25{ ( 2+(25-1)×5 }
sn= 25{ ( 2 + (24 )× 5 }
sn= 25{( 2 +120 )}
sn= 25 {(122)}
sn= 3050
May this answer help you
Answered by
1
Answer:
a=2,d=5,n=25,Sn=1550 I hope it is useful for you
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