Question

sum of all prime numbers which is less than 20​

Answer 1

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

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

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

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

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

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

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

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(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)

━━━━━━━━━━━━━━━━━━━━━━━━

(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)

Answer 2

Answer:

2+3+5+7+11+13+17+19

ans=77

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