The numbers are 9, 10 and 11 with a sum of 30.
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There are none. 9, 10 and 11 come closest giving 990
Start by examining the factors of 990. You will find that 9, 10 and 11 are factors. You will find that 9 x 10 is 90, which is a factor of 990. You will find that if you multiply 90 by 11 that you will get 990. So 9 x 10 x 11 = 990.
The smallest is 1*2*3 = 6 9*10*11 = 990 [but 10*11*12 = 1320 is too large]. So there are 9 products, with triplets starting with the numbers 1 to 9.
multiples of 10 will be divisible by 2 and 5 So Ap is 110,120,130....990 here 990 is the nth term ie an=990 a+(n-1)d=990 110+(n-1)10=990 (n-1)10=990-110 (n-1)=880/10 n-1=88 n=88+1 n=89
900 of them.