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The average of 4 distinct prime numbers ...

The average of 4 distinct prime numbers a,b,c and d is 35, where a `lt` b `lt` c `lt` d. and d are equidistant from 36 and b and c are equidistant from 34 and a, b are equidistant from 30 and c and d are equidistant from 40. the difference between a and d is :

A

30

B

14

C

21

D

Can't determined

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The correct Answer is:
B
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