7. The 17th term of an AP is 22, and the sum of the first 17 terms is 102. Find the 1st term and the common difference. ANSwer: a1=10;d=2 can you please help me understand the working
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Originally Posted by Benja303 7. The 17th term of an AP is 22, and the sum of the first 17 terms is 102. Find the 1st term and the common difference. ANSwer: a1=10;d=2 Every term of the AP is . So and Now it is your turn.
The nth term is: The sum of the first n terms is: Use the second equation to find , then use the first to find . What do you find?
Ohhh thanks mark. I was doing it was N/2 X the rest. I see . The 2 divides the entire thing. cool. Nice whip by the way.
Originally Posted by Benja303 Ohhh thanks mark. I was doing it was N/2 X the rest. I see . The 2 divides the entire thing. cool. Nice whip by the way. They are actually the same: Did you find that is different than the value you cited in your fist post?
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