The sum of first 8 term of an AP is 100 and sum of first 19 terms is 551. Find AP.
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Answer:
Step-by-step explanation:
HERE IS YOUR ANSWER;
Sn=n/2[2a+(n-1)d] Is the sum of the n terms.
NOW FOR THE EIGHTH TERM;
S8= 8/2[2a+(8-1)d]
S8=8a+28d=100
2a+7d=25 ......1)
Now,
Similar for 19th term;
s19=a+9d=29......2)
Now using elimination method;
a=2 and d=3
HOPE it helps
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hi have a good day 5+3
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