Question

If in an A.P. a,
16.2, d - 3, a -7.2 then find n.
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Answer 1

Answer:

16.2=-7.2+(n-1)-3

16.2+7.2=(n-1)-3

23.4=-3n+3

23.4-3=-3n

20.4/-3=n

-6.8=n