Question

plsss help...........​

Answer 1

Answer:

n/2[2a + (n – 1)d]=220

2n^2 + 78n - 440

n = 5

Step-by-step explanation:

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Answer 2

Answer : 56,980

step :

Sn = n/2 { ( 2a + ( n -1 ) d }

=220/2 {2×40 +( 220-1) ×2}.

=110{80+219×2}

=56, 980

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