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Sum of first 3 primes :
5th prime=11
∴1 is the number which when added to the sum of first 3 primes gives the fifth prime.

hope it helps and pls mark this as best answer
1 5 1
Sum of first 3 prime nos. 1+2+3=6
5th prime no.=7
no to be added=7-6=1
1 should be added
0 0 0
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