Question

Pradipta counted upto 1000 by 6's beginning with 6, Dropadi counted upto 1000 by 4's beginning
with 4 and Maricha counted upto 1000 by 5's beginning with 5. How many of the numbers were counted
by all of them​

Answer 1

pradipta counted upto by 6s bigining with 6

A.P 6,12,....996

a=6

d=12-6=6

an1=a+(n-1)d

an=6+6n-6

996=6n

n=166

upto 1000by 5s

5,10,15...1000

a=5

d=5

an2=a+(n-1)d

1000=5+5d-5

1000=5n

n= 200

upto1000 by 4s

4,8,18...1000

a=4

d=4

an3=a+(n-1)d

1000=4+4n-4

1000=4n

n=250

the numbers counted by all of them = an1+an2+an3

=166+200+250

=616

Answer 2

Answer:

1300 because all the numbers are hundreds