Question

8) 5, 9, 13, 17,........... Sum of
the 20 terms of this A. P. is​

Answer 1

Answer:

81

Step-by-step explanation:

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Answer 2

Answer:

AP OF 5,9,13,17 IS 81

Step-by-step explanation:

$9 - 5 = 4 \\ 13 - 9 = 4 \\ 17 - 13 = 4 \\ therefore \: difference \: is \: 4 \\ a = 5 \: \: n = 20 \\ \\ a + (n - 1) \times d=a20 \\ 5 + (20 - 1) \times 4 =a20\\ 5 + 19 \times 4=a20 \\ 5 + 76=a20 \\ 81 =a20\\ therefore \: a20 = 81$

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