Find the sum of all multiples of 7 lying between 500 and 900
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a= 504
d = 7
tn = 896
tn = 8+(n-1)7
896 = 504+(n-1)7
896-504= (n-1)7
392 =(n-1)7
392/7=n-1
56 =n-1
n = 57
d = 7
tn = 896
tn = 8+(n-1)7
896 = 504+(n-1)7
896-504= (n-1)7
392 =(n-1)7
392/7=n-1
56 =n-1
n = 57
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