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g(p)

by shashank.ism » Tue Feb 09, 2010 7:23 am
g(P) represents the product of all the digits of P, e.g. g(45) = 4 × 5. What is the value of
g(67) + g(68) + g(69) + ..... + g(122) + g(123)?

1381
1281
1481
1181
None of these
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by ajith » Tue Feb 09, 2010 9:47 am
shashank.ism wrote:g(P) represents the product of all the digits of P, e.g. g(45) = 4 × 5. What is the value of
g(67) + g(68) + g(69) + ..... + g(122) + g(123)?

1381
1281
1481
1181
None of these
6*(7+8+9) + 7(1+....9) +8 (1+2+..9) +9*(1+2+...+9) + 0+ 1*1*(1+...+9) +1*2*(1+2+3)

6*24 + 7*45+8*45+9*45+0+1*45+6*2 =
1 281
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