find the 10th term of an ap if the sum of 3rd and 8th term is 7 and the sum of the 7th and the 14th term is -3
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Answer:
-1
Step-by-step explanation:
Let the first term and common difference be a and d .
given
a+2d + a+7d = 7 &. a+6d + a + 13d=-3
2a + 9d = 7 and 2a + 19 d = -3
subtract equations : -10d = 10 or d = -1
and a = 8
So 10th term will be a+9d = 8 -9 = -1
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