Find the 20 th term of the AP 15 12 9 6
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Step-by-step explanation:
a=15
d= a2-a1
d= 12-15= -3
n=20
Tn= a+(n-1)d
= 15+(20-1)-3
= 15+19×(-3)
= 15-57
= -42
#666
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