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The n-th term of an AP is 7-4n. Find its common difference. |
| an = 7 - 4n So, a1 = 7 - 4(1) = 3 a2 = 7 - 4(2) = -1 a3 = 7 - 4(3) = -5 common difference = a3 - a2 = a2 - a1 (-5) - (-1) = (-1) - 3 cd = -4. |
