Question 328920
{[a + (a + 20d)] / 2} * 21 = 273 ___ 21a + 210d = 273 ___ a + 10d = 13


a + 4d = 7


subtracting equations ___ 6d = 6 ___ d = 1


substituting ___ a + 4(1) = 7 ___ a = 3


49th term ___ a + 48d = 51