C-10-Q061mediumsingle_mcq(1+x)7(1+x)^7(1+x)7 এর বিস্তৃতিতে দ্বিপদী সহগগুলি-a1, 7, 21, 35, 35, 21, 7, 1b1, 7, 14, 21, 21, 14, 7, 1c1, 6, 15, 20, 15, 6, 1d1, 7, 21, 42, 21, 7, 1