Find the number of terms in each of the following APs :
1) 18, 15 1/2, 13,....,-47
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Step-by-step explanation:
tn=a+(n-1)d
-47=18+(n-1)-3
-47=-18-3n+3
-47=-15-3n
-47+15+3n=0
-32+3n
n=32/3
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