Question

chatper:ap and gp
How many multiples of 4 lie between 10 and 250?

Answer 1

Answer:

ap : 12 , 16 , 20..................248

a = 12

d = 4

an = 248

an = a + (n-1) d

248 = 12 + (n-1) 4

248 = 12 + 4n - 4

248 = 8 + 4n

248 - 8 = 4n

240/4 = n

n = 60

therefore the no: of 4 multiple between 10 and 250 = 60

I think this is the answer..............I hope it helps you

Answer 2

Answer:

the multiples of 4 between 10 and 250 are 12,16,20,...................248.

a=12, d=4

let 248 be nth term of the AP.

an=a+(n-1)d

248=12+(n-1)4

248-12=(n-1)4

236=(n-1)4

n-1=236/4

n-1=59

n=59+1

n=60

so there are 60 multiples of 4 lies in between 10 and 250