Asked by Princ
The sum of 1st five terms of an AP nd the sum of the 1st seven termd of the same AP is 167. If the sum of the 1st ten terms of this AP is 235, find the sum of its1st twenty terms
Answers
Answered by
Scott
5a + 10d + 7a + 21d = 167
10a + 45d = 235
solve the system for a and d
S₂₀ = 20a + 190d
10a + 45d = 235
solve the system for a and d
S₂₀ = 20a + 190d
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