Doubt from binomial theorom

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Use multinomial theoram taking powers of a+b+d = 8 and consider cases b=1..8 might be a simpler method but can think of this only this right now

yes its correct but method

i tried but not getting answer

Yeah got it posting

see first find sum of cefficient which does not contain c by puting c=0 (a=b=c=1)

  • other case which do not contain b and c
    subtract both u will get result..
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yeah overcomplicated it you need to evaluate this

thank you