Question

59. How many pairs of prime numbers are
there which can be used to express 20%
the sum of two prime numbers ?
2) Two, 3) Three 4) Four
1) One​

Answer 1

Answer:

Prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17 and 19.

(i) 2+3=5 (divisible by 5)

(ii) 2+13= 15 (divisible by 5)

(iii) 3+7=10 (divisible by 5)

(iv) 3+17= 20 (divisible by 5)

(v) 7+13=20 (divisible by 5)

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