Question
If the 4 th term of an AP is 4 , then the sum of its first 7 terms is(a) 4(b) 28(c) 16(d) 40
Step 1
The nth term of an AP can be written as $a + (n-1)d$, where $a$ is the first term and $d$ is the common difference. So, we can write the 4th term as $a + 3d = 4$. Show more…
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Key Concepts
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