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Question

Solve : 31×10C1+32×10C2+33×10C3+....+310×10C10= ?

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Solution

31×10C1+32×10C2+33×10C3+....310×10C10=?
(1+x)n=nC0+nC1×ax1+ nc2x2+......nCnxn
Put x=3 and n=10
(1+3)10= 10C0+ 10C1×3+ 10C2×32+ 10C10310
3× 10C1+32× 10C2+33× 10C3+...........310× 10C10=(4)101

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