Question

find the sum of 7 terms of ap with a=550 and d=25​

Answer 1

n/2(2a+(n-1)d

just apply it

you will get ur required answer

Answer 2

Question : ✔️

• find the sum of 7 terms of ap with a=550 and d=25

Answer : ✔️

• sn = n/2 ( a + an )
• s7 = 7/2 ( 550 + a + ( n - 1 )d
• s7 = 7/2 ( 550 + 550 + ( 7 - 1 )25
• s7 = 7/2 ( 1100 + 175 - 25 )
• s7 = 7/2 ( 1100 + 150 )
• s7 = 7/2 ( 1250 )
• s7 = 3.5 ( 1250 )
• s7 = 4375