Question

The first, the third and the seventh terms of an increasing arithmetic progression are three consecutive terms of a geometric progression. In the first term of the arithmetic progression is 10 find the common difference of the arithmetic progression

Answer 1

AP: 10,10+2d,10+6d
GP: (10+2d)/10 = (10+6d)/(10+2d)
d = 5
check:
AP: 10,15,20,25,30,35,40
GP: 10,20,40

Answer 2

Two arithmetic progression have thd same first
and last terms.the first arithmetic progression has
21 terms with a common difference of 9.How
many terms has the other arithmetic progression
if its common difference is 4?working and
answer.thans

Answer 3

34

Answer 4

The 1st ,3rd& 7thterms of an A.P Form three consecutive terms of ba G.P . If the first two terms of the A.P is 6 ,find its 1st term and common difference