plsss help...........
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Answered by
0
Answer:
n/2[2a + (n – 1)d]=220
2n^2 + 78n - 440
n = 5
Step-by-step explanation:
thanks,
mark as brainlist
Answered by
1
Answer : 56,980
step :
Sn = n/2 { ( 2a + ( n -1 ) d }
=220/2 {2×40 +( 220-1) ×2}.
=110{80+219×2}
=56, 980
Please mark as brainlist answer .
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