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3. Write the first four terms of the sequence in which an = 9+ (n-1)4.​

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Answer:

→an = 3.n-1.

Putting n = 1,2,3,4 .

a1= 3×1–1 =2.

a2= 3×2–1 = 5.

a3=3×3–1 = 8.

a4 = 3×4–1= 11.

Thus , First four terms are 2 , 5 , 8 and. 11.

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