Question

Which term of the term AP -2 , -7 , -12......will be -77 ? Find the sum of the AP upto the term -77.

Answer 1

$Sum of n \: \: terms \: \: in AP \: \: \:$

$n/2[2a + (n – 1)d] \: \:$

$Sum of \: natural \: \: numbers \: </p><p>$

$n(n+1)/2$

$follow \: \: \: me$

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