Question

find the sum of all Integers of 3 digits which are divisible by 7​

Answer 1

Answer:

128

Explanation:

so basically the first 3 digit term which gets divided by 7 is 105

i.e A.P is 105,112,119......994

i.e last term is 994

therefore , common difference=7

tn= t1+(n-1)d. formula from A.P

994=105 + (n-1) 7

994= 105 +7n-7

7n=994-98

7n=896

n=128

therefore 128 3 digit terms can be divided by 7