Question

Find the sum of all the numbers which are co-prime to 60 and which are less than 60.

Answer 1

Co prime means two nos. Whose HCF = 1
Then the nos. which are Co prime to 60 and less than 60
1+7+11+13+17+19+23+29+31+37+41+43+47+49+53+59 = 480

Answer 2

co prime numbers between 1 to 59 are : 5 , 7 , 13 , 17 , 19 , 23 , 25 , 29 , 31 , 35 , 37 , 41 , 43 , 47 , 49 , 53 , 59 .




Sum of all these numbers = 5 + 7 + 13 + 17 + 19 + 23 + 25 + 29 + 31 + 35 + 37 + 41 + 43 + 47 + 49 + 53 + 59 = 533.