Question

How many multiples of 7 lie between 250 and 750

Answer 1

Answer:

Step-by-step explanation:

the first multiple is 252 and the last multiple is 749

so, the formula is

aₙ = a +  (n-1)d

aₙ = 749, a= 252 and d= 7

=>      749= 252 + (n-1) x 7

=>       $\frac{749 - 252}{7}$

=>      $\frac{497}{7}$ = 71

there are 71 multiples of 7 lying between 250 and 750

Answer 2

Answer:

an=a+(n-1)d

a=252. an=749 d=7 n=?

749=252+(n-1)7

749=252+7n-7

749=245+7n

749-245=7n

504=7n

n=72

answer is 72