find the number of intergers between 100 and 1000 that are divisiblw by 7 not divisible by 7
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Step-by-step explanation:
Let the 1st no. which divisibld by 7 is 105,2nd 112 and last is 994
so, a=105,d=7,An=994,n=?
°.°An=a+(n-1)d
.°. 994=105+(n-1)7
=>994=105+7n-7
=>994-105=7n-7
=>889=7n-7
=>889+7=7n
=>896=7n
=>896÷7=n
=>128=n
.°.n=128
.°. There are 128 no. of intigers between 100and1000 which divisiblw by 7
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