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3 years ago

Please help!!!!

Mathematics

1 answer:

nlexa [21]3 years ago

3 0

Answer:

225

Step-by-step explanation:

Using the basic components of summation ∑

∑n = $\frac{1}{2}$ n(n + 1) and ∑1 = n

Thus

∑ (2n - 1) ← for n = 1 to 15

= ∑2n - ∑1

= 2∑n - ∑1

= 2 ( $\frac{1}{2}$ n(n + 1)) - n

= n(n + 1) - n ← Evaluate for n = 15 ( the upper value )

= 15 × 16 - 15

= 240 - 15

= 225

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