SOLUTION....Sn = n/2 [2A+(n-1)d]where, n= 7 ,Sn = 77, a = first term and d = common difference. S7 = 7/2 [ 2a + (7-1)d]77 = 3.5 [2a + 6D]77/3.5 = 2a + 6d22 = 2a + 6d☞ a + 3d = 11.☞ a4 = 11.Hence the fourth term is 11.Hope this will HELP you.....☺☺☛ ⛧⛧ Mr. THAKUR ⛧⛧
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