Question

Which term of AP 5,2,-1,-4...is - 40

Answer 1

${\huge{\boxed{\red{Answer:-}}}}$

${Ap:5,2,-1,-4........}$

$here \: \: a = 5 \: and \: d = 2 - 5 = - 3 \\ so \: an = - 40 \\ a + (n - 1)d = - 40 \\ 5 + (n - 1) - 3 = - 40 \\ (n - 1) - 3 = - 40 - 5 \\ (n - 1) - 3 = - 45 \\ (n - 1) = \frac{ - 45}{ - 3} \\ n - 1 = 15 \\ n = 16th \: term.(ans)$

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