Help me out in this problem

Number of subsequences of the string in the form a^i b^j c^k
where i>=1,j>=1 && k>=1
how to approach this problem recursively

@HimanshuSingh99 are u there ?

@shivammishra20121999

@himanshu_aswal bro i have read this blog can you explain the intution behind this

@shivammishra20121999

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