sum of first q th term of A.P is 162. the ratio of 6th term and 15th is 1:2 . find first and 15th term.
abhi178:
what is qth term
here numerical value exist
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Ratio = (a+5d) / (a+ 9d) = 1/2
=> a + d = 0 => a = -d
sum of 9 terms = 162
9/2 * (2a + 8 d) = 162
6d = 36
d = 6
a = -6
first term = -6,
15th term = -6 + 14*6 = 78
=> a + d = 0 => a = -d
sum of 9 terms = 162
9/2 * (2a + 8 d) = 162
6d = 36
d = 6
a = -6
first term = -6,
15th term = -6 + 14*6 = 78
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how q th term =9th term
yes.l agree with abhi178. How can you say that 9th term is q th term
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