Which term of ap 21,18,15.... is-42?
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Answer:
22 th term
Step-by-step explanation:
d = 18 - 21 = -3
a = 21
nth term = a + (n-1)d
-42 = 21 + (n-1) (-3)
-42 = 21 - 3n + 3
3n = 66
n = 22
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