Ex 3.2
Ex 3.2, 2 (a)
Ex 3.2, 2 (b) Important
Ex 3.2, 2 (c)
Ex 3.2, 2 (d)
Ex 3.2, 2 (e) Important
Ex 3.2, 2 (f) Important
Ex 3.2, 2 (g)
Ex 3.2, 2 (h) Important
Ex 3.2, 2 (i) Important
Ex 3.2, 2 (j)
Ex 3.2, 3 Important
Ex 3.2, 4
Ex 3.2, 5
Ex 3.2, 6 (a) Important
Ex 3.2, 6 (b)
Ex 3.2, 6 (c) Important
Ex 3.2, 6 (d)
Ex 3.2, 7 Important
Ex 3.2, 8
Ex 3.2, 9 Important
Ex 3.2, 10 Important
Ex 3.2, 11 You are here
Ex 3.2, 12 Important
Last updated at April 16, 2024 by Teachoo
Ex 3.2, 11 Write five pairs of prime numbers less than 20 whose sum is divisible by 5. (Hint : 3 + 7 = 10)Numbers divisible by 5 are 5, 10, 15, 20, 25, 30 (All these are also called multiples of 5) We need to write these as sum of 2 prime numbers less than 20 i.e. using 2, 3, 5, 7, 11, 13, 17, 19 (1) 5 = 2 + 3 (2) 10 = 3 + 7 (3) 15 = 2 + 13 (4) 20 = 3 + 17 (5) 20 = 7 + 13 So Pairs are (2, 3) ; (3, 7) ; (2, 13) ; (3, 17) ; (7, 13) (Both 2 and 3 are prime) (Both 3 and 7 are prime) (Both 2 and 13 are prime) (Both 3 and 17 are prime)