WBJEE 2

The sum of all 5 digit nos. formed by the digits 1,3,5,7,9 when repetetions are alowed is

a)66666600 b)6666600 c)56*11111 d) 55*11111

3 Answers

11
virang1 Jhaveri ·

see the units place will have 1,3,5,7,9
If we take 9 then there are 54 ways
Therefore total will be 54(9+3+5+7+1) = 56

Total summation will be
56 + 1056 + 10056 + 100056 +1000056

56(1+10+100+1000+10000
Therefore option c)

11
virang1 Jhaveri ·

Is it rite?

1
kamalendu ghosh ·

I too got that..virang..thnx...but the ans is d

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