write an arithmetic sequence with common diffrence 2. Find its 11th form ?
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a3 - a2 = d
⇒ a3 = a2 + d
⇒ a3 = (a + d) + d
⇒ a3 = a + 2d
⇒ a3 = (3 - 1)a + d:
a4 - a3 = d
⇒ a4 = a3 + d
⇒ a4 = (a + 2d) + d
⇒ a4 = a + 3d
⇒ a4 = (4 - 1)a + d:
a5 - a4 = d
⇒ a5 = a4 + d
⇒ a5 = (a + 3d) + d
⇒ a5 = a + 4d
⇒ a5 = (5 - 1)a + d:
Similarly, a6 = (6 - 1)a + d:
a7 = (7 - 1)a + d:
an = a + (n - 1)d.
Therefore, nth term of an Arithmetic Progress whose first term = ‘a’ and common difference = ‘d’ is an = a + (n - 1)d.
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