i have got the same answer (C) using the following matrix (Attachment) (instead of formula: MGMAT way). Can someone please tell if anything is wrong in my process.

overlaapping Set

How many members of a certain country club play both squash and racquetball?

(1) 110 members of the country club play either squash or racquetball.

(2) 70 members of the country club play squash and 65 members of the country club play racquetball.


Source: Veritas Prep

for Q 2: x=-1/3 does not satisfy the inequality.
neither does x=2/5

for Q2) Is pq =1 ?

(1) p2q = p (it is p squared times q = p)
(2) q2p = q (it is q squared times p = q)

Can someone please explain why the answer is NOT C?

Well I think the question is asking for identification numbers (which should be unique?).
your method gives the answer 3600. which includes e. g. {9557) twice.
i think only 9C1*10C1*8C1*4C1=2880 can give unique numbers= identification numbers.

Can someone please verify and explain.

T is directly proportional to square if r
i. e. T ∞ r^2
T is Inversly proportional to cube of s
i. e. T ∞ 1/s^3

if r triples we get T ∞ (3r)^2= 3^2*r^2= 9r^2
if s doubles we get T ∞ 1/(2s)^3= 1/(2^3*s^3)= 1/(8s^3)

Therefore, if the given conditions happen, the value of T becomes (9/8)T

4 or 6 has to be the last digit for the number to be even. and the integers have to be greater than 40000. i. e. for the 1st digit we have 3 digit after picking 4 or 6 as last digit. 3*_ _ _ *2 for the 2nd digit we have 3, {5/9}, {4/6} i e. 3*3* _ *_ *2 following the similar manner we have: 3*3*2*1*...