Question

if sum of 3rd and 8th term of an ap is 7 and sum of 7 and 14 term is minus 3 then find the 10th term

Answer 1

$a + 2d + a + 7d = 7 \\ 2a + 9d = 7 \:first \: equation \\ a + 6d + a + 13d = - 3\\ 2a + 19d = - 3 < second \: equation > \\ from1and2we \: get \: d = 1 \\ therefore \: a = 1$