in an ap is equal to 8 and first term is 2 then it is common difference is a 1 3 2 5
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AP general formula: a + (n-1)d
a =2 , d=3-1 = 2
AP =8
a+(n–1) d =8
2+ (n-1) 2 = 8
2 + 2n–2= 8
2n = 8
n = 8/2
n = 4
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