Could someone please explain how to answer these tricky questions:
1) Which term of the series 8 - 4 + 2 - .... is equal to 1/128 ?
2) Which term of the series 3 + 21 + 147 + .... is equal to 352,947 ?
3) Which term of 7/9 + 14/45 + 28/225 + ... is equal to 224/28,125 ?
4) The third term of...