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Question
Fill in the blank in the following table, given that a is the first term, d the common difference, and an nth term of the AP:
| a | d | n | an |
| 7 | 3 | 8 | ______ |
Solution
| a | d | n | an |
| 7 | 3 | 8 | 28 |
Explanation:
a = 7, d = 3, n = 8, an = ?
We know that,
For an A.P. an = a + (n - 1) d
= 7 + (8 - 1) 3
= 7 + (7) 3
= 7 + 21
= 28
Hence, an = 28
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