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Question 6 The partial sum 1+3+5+...+39 equals =
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17 votes
Question 6
The partial sum 1+3+5+...+39 equals =

User Commadelimited
by
6.1k points

1 Answer

5 votes

Answer:

400

Explanation:

The 20 terms of the sum can be formed into 10 pairs, each with a sum of 40:

= (1 +39) +(3 +37) +(5 +35) + ... +(19 +21)

= 40 × 10 = 400

The indicated sum is 400.

User Tweej
by
6.5k points
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