If 7th term and 13th term of ap is 34&64 then find it 18th term
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a7 = a+ 6d.............. (1)
a13 = a+12d............. (2)
Substract both these eq
a+6d = 34
a+12d = 64
- - -
-6d = - 30
d = 5
Put in eq (1)
a+6×5 = 34
a = 4
a18 = a+17d
= 4+17×5
= 89
Hope it helps
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a13 = a+12d............. (2)
Substract both these eq
a+6d = 34
a+12d = 64
- - -
-6d = - 30
d = 5
Put in eq (1)
a+6×5 = 34
a = 4
a18 = a+17d
= 4+17×5
= 89
Hope it helps
Mark as the BRAINLIEST
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