Question
The second term of an arithmetic progression I four times the fits term, and the first term is ten.
Find the common difference and hence find the sum of the first 12 terms.
Find the common difference and hence find the sum of the first 12 terms.
Answers
Steve
a+d = 4a
a = 10
10+d = 40
d = 30
S12 = 12/2 (2*10 + 11*30)
a = 10
10+d = 40
d = 30
S12 = 12/2 (2*10 + 11*30)
Anonymous
The sum of the 3rd and 7th term of an AP is 38 and the 9th term is 37.find the AP