3 years ago

PLEASE HELP ME GUYS!!

Mathematics

1 answer:

Softa [21]3 years ago

8 0

Answer:

n=20

Step-by-step explanation:

$S_{n} =\frac{n(a_{1}+a_{n})}{2}\\\\1260 =\frac{n(25+101)}{2} \\\\n = 20$

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