Find the sum of integers in between 50 and 500 divisible bh 7
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sn=n/2(a+l)
56,63,...497
an=a+(n-1)d
497=56+(n-1)7
497=56+7n-7
497=63+7n
497-63=7n
n=62
sn=62/2(56+497)
sn=553×31
sn=17143
56,63,...497
an=a+(n-1)d
497=56+(n-1)7
497=56+7n-7
497=63+7n
497-63=7n
n=62
sn=62/2(56+497)
sn=553×31
sn=17143
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