Question

Please help!!!!
How many terms of the A.P -17 -15 -13........ are needed to make the sum -72?
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Answer 1

Step-by-step explanation:

an=-72, a=-17,d=2,n=?

an=a+(n-1)d

-72=-17+(n-1)2

55/2=(n-1)

27.5+1=n

28.5=n

29th term

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