Cocoa Blast represents the H since he had it only twice in 5 days.
We need to count all ways to arrange 2 H and 3 Ts.
If one H is in first position, then the second H could be in 2nd, or 3rd, or 4th or 5th position .(4 ways) ;
If one H is in second position then the second H colud be in 3rd, 4th, or 5th. ( 3 ways) ;
If one H is in the third position the second H could be in 4th or 5th position. ( 2 ways);
If one H is in the fourth position the second H cold be in in the 5th position( 1 way)
Answer: 4+3+2+1= 10 all posible ways
HHTTT. THHTT. TTHHT. TTTHH
HTHTT. THTHT. TTHTH
HTTHT. THTTH
HTTTH