Asked by Ola

the first and last term of an A.P are 21 and -47 respectively. if the sum of the series is given as -234. Find the number of term of the A.P and the common difference
Answered by oobleck
n/2 (21-47) = -234
n = 18
d = (-47-21)/17 = -4
Answered by David
Nice
Answered by David
Nicely done
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