how many multiples of 4 lie between 100 and 250.also find its sum

here a= 102 and an= 258
and d= 4

an= a + (n-1)d
258   = 102+ (n-1)(4)
258   = 102 + 4n - 4
258 = 98 + 4n
258 - 98 = 4n
160 = 4n
160/4 = n
40 = n
now u can find sum from all the given datas