Question

$(ap) \: \: 4.9.14.19 \: \: \: \: \: \: \: \: 79$
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Answer 1

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a = 4

d = 5

79 = 4+(n-1)5

79-4 = (n-1)5

75/5 = n-1

n = 15+1

n = 16

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