Question

first term and common difference of an A.P. are 12 and 4 respectively if tn = 96 find n

Answer 1

an = a + ( n - 1 ) d

96 = 12 + (n - 1 ) 4

96 = 12 + 4n - 4

4n = 96 - 8

4n = 88

n = 22

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Answer 2

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