Math, asked by saritaraskar6956, 1 year ago

The sum of series in

a.P.Is 72 the first term is 17 and the common difference is -2 .The number of terms is

Answers

Answered by aryarishi

1

Answer:

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Step-by-step explanation:

a=17,c.d=2

72=17+(n-1)2

36=17+(n-1)

19=(n-1)

20=n

n=20 answer

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