Here a = a + (n – 1) d = 78 n a= 3, d = 8- 3 = 5Therefore,3 + (n -1) (5) = 78(n-1) * 5 = 78 – 3 = 75n – 1 = 75/5 = 15n = 15 + 1 = 16Hence a 16 (sixteenth term) is 78.
Aptitude
Topic: Progressions
Which term of the A.P. 3,8,13 …is 78?
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