Q. 75.0( 3 Votes )

The fifth term of a G.P. is 1875. If the first term is 3, find the common ratio.

Answer :

a1 = 3 and a5 = 1875

an = a1rn-1 (n = no. of term, a1 = first term of G.P, r = common ratio)

a5 = a1r4

1875 = 3r4 ………(1)

r5 = 625

r5 = 55

r = 5 is the common ratio.

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