which term of AP : 3,8,13,18,...........is 78?
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T1 = 3, T2 = 8 T3 = 13.......
T2 -T1 = 8-3 = 5
T3 - T2 = 13 -8 = 5
d= 5..... means common difference.
T1 = 3, d = 5, n = 78
tn = a + (n-1) d
t78 = 3+ ( 78- 1) 5
78-3 + ( 78-1)5
75 + (78-1)5
. 75/ 5 = (78-1)
15= 76
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