Is there any trick to evaluate this or this is an approximation, I mean I am not allowed to use calculator.

√7√7√7√7√7⋯

**Answer**

√7√7√7√7√7…=712⋅714⋅718⋯=712+14+18+⋯=7121−12=7

**Attribution***Source : Link , Question Author : user2378 , Answer Author : Madrit Zhaku*