A seven digit number has to be formed using 1,2,3 (and not necessarily all of them) with 1 nev
11 views · Published 13 October 2018 · 4:26 · Indexed 8 October 2026
Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW A seven digit number has to be formed using 1,2,3 (and not necessarily all of them) with 1 never immediately followed by 2, 2 never immediately followed by 3 and 3 never immediately followed by 1. The number of such numbers equals
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