Given the pattern in the provided numbers, how would you express the number represented by '?' ?
$$1,1,9,27,25,125,?,343$$

The given series is an alternating sequence of squares and cubes of consecutive odd numbers:
* $1^{\text{st}}\text{ term}=1^2=1$
* $2^{\text{nd}}\text{ term}=1^3=1$
* $3^{\text{rd}}\text{ term}=3^2=9$
* $4^{\text{th}}\text{ term}=3^3=27$
* $5^{\text{th}}\text{ term}=5^2=25$
* $6^{\text{th}}\text{ term}=5^3=125$
* $7^{\text{th}}\text{ term}=7^2=49$ (This is '?')
* $8^{\text{th}}\text{ term}=7^3=343$

Hence, the missing value is $49$.