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Anonymous Anonymous
  • 10-02-2015
  • Mathematics
Answered

A= 13+26+39+...+169


What is the sum of the prime numbers that can divide A ?



A)16 B)18 C)20 D)22 E)24

Verified Answer :

eu99li
eu99li eu99li
  • 12-02-2015

A= 13+26+39+...+169=

= 13(1+2+3+....+13)=

=13 (1314)/2=

=13137

=> 13+7=20

So the answer is c)

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