CAT Exam Numerical Ability

find sum of series 58+811+11*14+...upto n terms

Read Solution (Total 2)

5*8+8*11+11*14+14*17.....
10 years agoHelpfull: Yes(0) No(0)

nth term = (3n+2)(3n+5)
= 9n^2 + 21n + 10

Sum to n terms
= 9*n(n+1)(2n-1)/6 + 21*n(n+1)/2 + 10n
= n(3n^2 + 15n + 22).
9 years agoHelpfull: Yes(0) No(0)

CAT Other Question

The sum of x% of y and y% of z is z% of x. x and z are integers such that 1 =< x =< 9, 1 =< z =< 9. If y is a perfect square number then how many ordered pair (x, z) are possible satisfying the given condition.

OPTION 1) 1
2) 2
3) 3
4) 4
5) 5
6) 6
7) 7
8) 7
9) 9
10)0

A reduction of 10% in the price of sugar enables a housewife to buy 6.2 kg more for Rs.279.Find the reduced price per kilogram.
(a)Rs. 5 (b) Rs. 4.5 (c) Rs. 4.05 (d) None of these