Math, asked by alpana2002, 1 year ago

solve que 15
send ans fast

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rajeshkumar437: I don't know

alpana2002: ok

Answers

Answered by kishanpentyala

$sum \: of \: first \: 10 \: terms = - 150 \\ = a + 9d \\ sum \: of \: first \: 20 \: terms = a + 19d \\ = - 150 - 550 = - 700 \\ by \: solving \: both \: eqns \: we \: get \\ d = - 55 \: \: \: and \: \: \: a = 345 \\ so \: a.p \: is \: 345 \: \: 295 \: .....$

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