Sequences and Series
If a,b,c,d,e,f are A.M. ′s between 2 and 12, then find the sum: a+b+c+d+e+f.
Connecting you to a tutor in 60 seconds.
Get answers to your doubts.
Show that the sum of (m+n)thand (m−n)thterms of an A.P. is equal to twice the mthterm.
Find the sum to n terms of the series :1×2+2×3+3×4+4×5+......
Find the sum to n terms of the series, whose nthterms is given by : n2+2n
Write the first three terms in each of the following sequences defined by the following:(i) an=2n+5 (ii) an=4n−3
Which term of the AP: 3, 15, 27, 39, . . . will be 132 more than its 54thterm?
How many terms of G.P. 3,32,33,˙˙˙are needed to give the sum 120?
Find the sum to n terms of the sequence, 8, 88, 888, 8888 . . . .