which term of th AP : 21,18,15.....is -81
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Answer:
14th term
Step-by-step explanation:
Given AP is 21,18,15,.........,-18
a=21, d=18-21
= -3
an=-18
an=a+(n-1)d
= -18=21=(n-1)*-3
= -18-21=(n-1)*-3
=-39=(n-1)*-3
= -39/-3=(n-1)
=13=n-1
=13+1=n
=14=n.
∴ The 14th term of the given AP: 21,18,15,..... is -18
Step-by-step explanation:
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