Question

AP . = 78, 80, 82, 84, 78 ...... 356

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Answer 1

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Answer 2

Step-by-step explanation:

a=78,d=80-78=2,an=356

We have

an=a+(n-1)d

356=78+(n-1)2

278=2n-2

280=2n

N=280/2

N=140..

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