The 20th term of the AP 3, 7, 11, 15, ... is:
A80
B75
C83
D79 (a=3, d=4; a_n = 3 + 19×4 = 79)
Answer & Solution
Correct answer: D. 79 (a=3, d=4; a_n = 3 + 19×4 = 79)
AP: a = 3, d = 4. a_n = a + (n-1)d. a_20 = 3 + 19(4) = 3 + 76 = 79.
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