Difference AP

Calculate the difference of arithmetic progression if the sum of its first 10 members Sn = 1325 and the first member is a1 = 20

Final Answer:

d =  25

Step-by-step explanation:

S=1325 a1=20 n=10  S = n 2 a1 +an  an=n2 Sa1=102 132520=245  an = a1+(n1)d  d=n1ana1=10124520=25   Verifying Solution:  s2=2a1+an n=220+245 10=1325



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