Progression (Sequence and Series)Hard
Question
Three numbers are in A.P. The product of the extremes is 5 times the mean, also the sum of the two largest is 8 times the least, the numbers are-
Options
A.3,9,15
B.6,18,30
C.3,8,13
D.6,16,26
More Progression (Sequence and Series) Questions
If the 9th term of an A.P. be zero, then the ratio of its 29th and 19th term is-...S.D. of n observations a1, a2, a3,....,an is σ, then the S.D. of the observations λa1, λa2, λa3, &#...If A,G and H are respectively A.M., G.M., and H.M. of three positive numbers a, b and c, then the equation whose roots a...-A man arrange to pay off a loan of Rs.3600 by 40 annual instalments which are in AP. When 30 of the instalments are pai...The S.D of the first n natural numbers is-...