If 7th and 13 th term of an AP are 34 and 64 respectively then it's 18 th term is
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Answer:
a + 6d = 34. -----1
a + 12d = 64. -----2
2 - 1
a + 12d - a - 6d = 64 - 34
6d = 30
d = 30/6
d = 5
put in 1
a + 6(5) = 34
a + 30 = 34
a = 34 - 30
a = 4
18th term = a + 17d = 4 + 17(5) = 4 + 85
= 89
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