how to prove the sum of …
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Naveen Sharma 7 years, 3 months ago
Ans.
Let first term of AP is a and comman difference is d.
as we know
=>
=>
And
=>
According to Question
=>
=> 3a + 27d = a + 29d
=> 2a = 2d
=> a = d ............. (1)
Sum of first 6 terms = 42
We know
=>
=>
=>
=> a = 2
First term is 2. Common difference is 2.
=>
= >
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0Thank You