Question

in an A.P. given a = 5 , d = 4 , an = 40 , find n and Sn.​

Answer 1

Step-by-step explanation:

an=a+(n-1)d

40=5+(n-1)4

n-1=40-5/4

n-1=35/4

n=39/4

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Answer 2

Answer:

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Step-by-step explanation:

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