3 years ago

Question 8 of 14

Mathematics

2 answers:

diamong [38]3 years ago

7 0

Answer:

144.

Step-by-step explanation:

Sum of n terms = (n/2)[a1 + l] where a1 = first and l = last term.

There are ( 1 + 23) / 2 = 12 terms in this series.

So the sum = (12/2) [ 1 + 23]

= 6 * 24

= 144.

Oxana [17]3 years ago

3 0

Answer:

276 is correct

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