How many terms are there in ap 18 , 15 1/2 , 13............-47?
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Answer:
27 terms
Step-by-step explanation:
d = a2-a1
d = 15.5 - 18
d = -2.5
a = 18
a27 = a + (n - 1)d
= 18 + (27 - 1)× -2.5
= 18 + (26 × -2.5)
= 18 - 65
= -47
hence proved
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