in an ap find a and an if a=2 d=8and
sn=90
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Here we use
Sn = (n/2)(2a+(n-1)d)
90 = (n/2)(4+(n-1)8)
180 = n(8n-4)
180 = 8n^2-4n
8n^2-4n-180 = 0
n=5
please please please please please mark has brainliest answer
Sn = (n/2)(2a+(n-1)d)
90 = (n/2)(4+(n-1)8)
180 = n(8n-4)
180 = 8n^2-4n
8n^2-4n-180 = 0
n=5
please please please please please mark has brainliest answer
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