The `4^(th)` term of a G.P. is square of its second term and the first term is -3.Determine its `7^(th)` term.

Explanation

`4^ th ` term `=beginarray/ll (Second term) ^2 rarr a xx r^3=(a xx r)^2 rarr a xx r^3endarray=a^2 xx r^2`
`rarr a=r rarr a=r^prime=-3 therefore 7^th` term `=: a xx r^6=-3 cdot xx(-3)^6=(-3)^7=-2187~T`