Brent@GMATPrepNow wrote:
S1 = {1} (1 number)
S2 = {2, 3} (2 numbers)
S3 = {4, 5, 6} (3 numbers)
S4 = {7, 8, 9, 10} (4 numbers)
.
.
.
S29 = {?????} (29 numbers)

To find out, we need to find the sum of 1+2+3+4...+27+28+29

Tough PS-3

There are four numbers in sequence. The average of first three is 6; the average of the last three is 7 and
the last number is 3 more than the first. The average of second & third numbers is:
(A) 6 (B) 6.5 (C) 5.75 (D) 7 (E) Indeterminate

Tough PS-1

N, a set of natural numbers is partitioned into subsets: S1 = {1} S2 = {2, 3} S3 = {4, 5, 6}
S4 = {7, 8, 9, 10} and so on. The sum of the elements of the subset S30 is:
(A) 12505 (B) 14115 (C) 13515 (D) 16505 (E) 14000

Please provide your approach to solve this prob.

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