Question

some piece of threads having length 2m,4m,8m, then show that the total length of 6^th, 7^th, and 8^th pieces is 448 metres.

Answer 1

2^6+2^7+2^8=64+128+256=448

Answer 2

the length =2^6+2^7+2^8=64+128+256=448 m