Sum of four consecutive odd numbers is 208. Find the largest number.
1). 55
2). 57
3). 59
4). 61
Let the consecutive odd numbers be x, x + 2, x + 4, x + 6
According to the question,
x + x + 2 + x + 4 + x + 6 = 208
⇒ 4x + 12 = 208
⇒ 4x = 208 – 12
⇒ 4x = 196
⇒ x = 196/4 = 49
∴ The largest odd number is x + 6 = 49 + 6 = 551. If $X=3^{\frac{1}{3}}-3^{- \frac{1}{3}}$ then the value of $3X^{3}+9X$ is:
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