The third and eleventh term of an arithmetic progression are 15 and 25 respectively. Find the:
A.common difference
B.first term
C.number of terms that will give a sum of 30
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1 answer

a11a3 = 8d = 40
now find a, and then n such that
n/2 (2a+(n1d)) = 30 👍
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answered by oobleck
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