How many 4 digit words are possible by using English alphabet a to z with condition one alphabet is not allow more than twice consecutively ex- \"aaab\", \"cccc\" not allowed

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06 May 2010 How many letter are possible? How many 4 digit words are possible by using English alphabet a to z with condition one alphabet is not allow more than twice consecutively ex- "aaab", "cccc" not allowed: OPtion
1) 456976
2) 455650
3) 456345
4) 331776
5) 358800
6) 234545
7) 453444
8) 355650
9) 546784
10) 1360; Correct Option: 2 Best Solution (3)

sanjib biswas 15 years AGO

total possible combinatoin is
26^4-(26+26*25*2)=455650

Like? Yes (1) | No

Dr.Dipin Singh 15 years AGO

24*C(26, 4) + 12*3*C(26, 3) + (6 + 4)*C(26, 2)
= 455650

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S. Singh 15 years AGO

option 2 is the answer

Like? Yes (1) | No

Dimple

India

Punjab

Time: 00:01:33

Points

Maths Quotes

Small minds discuss persons. Average minds discuss events. Great minds discuss ideas. Really great minds discuss mathematics.

Anon

A MAN IS LIKE A FRACTION WHOSE NUMERATOR IS WHAT HE IS AND WHOSE DENOMINATOR IS WHAT HE THINK ABOUT HIMSELF LARGER THE DENOMINATOR SMALLER THE FRACTION

UNKNOWN

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How many 4 digit words are possible by using English alphabet a to z with condition one alphabet

M4maths Previous Puzzles

06 May 2010 How many letter are possible?