Progression (Sequence and Series)Hard
Question
If the ratio of sum of n terms of two A.P′s is(3n + 8) : (7n + 15), then the ratio of 12th terms is-
Options
A.16 : 7
B.7 : 16
C.7 : 12
D.12 : 5
More Progression (Sequence and Series) Questions
A boy goes to school from his home at a speed of x km/hr. and comes back at a speed of y km/ hr. then the average speed ...Let σ be the standard deviation of n observations. Each of the n observations is multiplied by a constant c. Then ...Sum to infinite of the series 1 + +....... is -...The real values of x for which y = 1 ++.......∞ is finite, is -...The standard deviation of a variate x is σ. The standard deviation of the variable ; a, b, c are constants, is-...