Aspire Faculty ID #16464 · Topic: NIMCET 2009 · Just now
NIMCET 2009

How many 5s are there in the number series each of which is immediately followed by 4 but not immediately preceded by 6? Series: 456 656 455 455 654 456 456 5454

Solution

We check every 5 followed by 4 and not preceded by 6. Only the two 5s inside 5454 satisfy this condition.

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