A=8d=8n=7 sn=n/2 (2a+(n-1)d)sn=7/2 (2×8+(7-1)8)sn=7/2 (16+48)sn=7/2 (64)sn=7×32average = total sum /2 average =7×32/2 average =7 × 16 average of first seven MULTIPLES of 8 = 112
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