Question

Sum of first hundred numbers common to the two A.P's 12,15,18..and17,21,2 is

Answer 1

Answer:

60450

Step-by-step explanation:

1)12,15,18,21,24........

2)17,21,25.........

a=21

d=12

n=100

S100=n/2[a+(n-1)d]

=100/50[21+(100-1)×12]

=50[21+99×12]

=50[21+1188]

=50×1209=60450

hope it help

Answer 2

Answer:

I don't know soory

please excuse me