Question

check whether the following numbers are composite or not 1 × 20 × 21 + 10 × 5 × 7
please please please please please please please please please please please please help me​

Answer 1

1*20*21+10*5*7

= (10)(7)(1*2*3+1*5*1)

this number can be express as product of more than two numbers

so the number is composite number

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Answer 2

yes, it is a composite no.

i.e:1×2×10×21+10×5×7

= 10(1×2×21+1×5×7)

=10(42+35)

=10×77×1

so , clearly it has more than 1 factor

hence , it is a composite no.