CBSE Class 10 Answered
explain
Asked by | 06 Mar, 2009, 12:34: PM
Expert Answer
A number is a composite number if it has factors other than 1 and itself.
Now, 7x 11x 13+13 = 13 (7 x 11 +1) = 13 x 78.
This number has factors like 2, 3 and 13 as its factors other than 1 and itself. Hence it is a composite number.
7 x 6 x 5 x 4 x 3 x 2 x 1 + 5 = 5 (7 x 6 x 4 x 3 x 2 x 1 + 1) = 5 x 1009
This number has factors other than 1 and itself (Viz. 5). Hence, it is a composite number.
Answered by | 06 Mar, 2009, 12:59: PM
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