Question

the 21th term of ap whose first two terms are 3 and -3 is ?​

Answer 1

Answer:

$a = 3 \\ d = - 6 \\ a21 = a + 20d \\ = 3 + 20 \times - 6 \\ = 3 - 120 \\ = - 117$

Answer 2

Step-by-step explanation:

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