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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

  1. a11-a3 = 8d = 40
    now find a, and then n such that
    n/2 (2a+(n-1d)) = 30

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