gmat paper test code 37 section 6 q 5

Question

plz explain

xcusemeplz2009 · Answer

IMO B

s1)IF WE CONSIDER EXTREME CASE 13*4=52 , REST TWO NUMBERS SUMMATION SHOULD BE 8 , THERE CAN BE N NUMBER OF COMBINATION...HENCE INSUFF

S2) SUM OF ANY THREE NO CAN BE 12 ONLY WHEN EACH NO. IS 4 ...HENCE YES...SUFF

tuhinkanti · Answer

Answer B. Sum of any three numbers is 12 and this can only happen if they are equal and equal to 4

blover · Answer

why cant we take it as arithmetic series / progression

where S=60 ( sum of 15 terms )
a first item in AP 
d=4 common difference 
n=15 number of terms

S= n/2 {2a+(n-1) d}

xcusemeplz2009 · Answer

from st1) its not necessary that its in ap

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