3 years ago

Find the sum of the sequence. 39 +40 +41 +42 + ... + 138

Mathematics

1 answer:

Elis [28]3 years ago

6 0

Answer:

Sol1 you can use "first(first+last)/2" is 138(138+1)/2 - 38(38+1)/2 = 8850

Sol2 or you can look this 39+40+41+....+100+(100+1)+(100+2)+....+(100+38) = 1+2+3+.....+99+100+100(38) = 5050+3800 =8850

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