Consider all positive two digit numbers each of which when divided by 7 leaves remainder 3. What is their sum
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hey mate!!!!..
the no. exactly divisibe by 7
14,21,28……98.
the no. which leaves reminder of 3.
add 3 to each no. which are exactly divisible by 7
10,17,24,31…94
(7+3=10 two digit, 98+3=101 not a 2digit no.)
this is a A.P. a=10,d=7
an=a+(n-1)d
94=10+(n-1)7
n=13
sn = n/2(a+l)
=13/2(10+94)
676
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