How many strings of seven lower case letters of the English alphabet contain exactly four letters w in them? Select all that applies.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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How many strings of seven lower case letters of the English alphabet contain exactly four letters w in them?
Select all that applies.
267x 4
C(7,4)×253
O C(7,4) × 263
7!
x 253
3!4!
546,875
P(7,4)×253
35
Transcribed Image Text:How many strings of seven lower case letters of the English alphabet contain exactly four letters w in them? Select all that applies. 267x 4 C(7,4)×253 O C(7,4) × 263 7! x 253 3!4! 546,875 P(7,4)×253 35
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