Question

Sum of those integers from 1 to 500 which are multiples of 2 or 5

Answer 1

Answer:

12750

Step-by-step explanation:

no.of terms =50

a=10

d=2*5=10

sn=n/2(2a+(n-1)d)

   =50/2(2*10+(50-1)10)

   =25(20+49*10)

   =25(20+490)  

   =25*510

   =12750.

Hope this will be helpful. Sorry if there is any mistake in the solution

Answer 2

the integers which are divisible by 2 and 5 both are 10 20 30 40 50 60 70 80 90 100 110 120 130-140 150-160 170-180 190-200 210 220 230-240 250 260 270 280-290 300 310 320-330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500

probability of getting an divisible by 2 and 5 both integers

= number of favourable event/ total number of event

=here number of favourable events are 50 and total number events are 500

So,

=50/500

=1/10

probability = 1/10