Question

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 1

HEY MATE , here is your answer

Let a be the first term and d be the common difference
(8/2)(2a+8-1)d = 100
_:2a +7d = 25--let it be the first equation.
and (19/2)(2a +(19-1)d)= 551
--:2a+8d = 58--let it be the second equation.
substituiting eq.1 and 2 we get,
11d = 33
d= 3
so, a= (25-21)/2=2
so, AP= 2,5,8,11,14...

Answer 2

Answer:

Step-by-step explanation: