Question

What is the value of 7C0+7C1

Answer 1

Answer:

Explanation:

Sol:

Given 7C1 + 7C2 +7C3 + 7C4 + 7C5 + 7C6 + 7C7

We know that 7C3 = 7C4  , 7C2 = 7C5  , 7C1  = 7C6  

⇒ 7C1 + 7C2 +7C3 + 7C3 + 7C2 + 7C1 + 7C7

⇒ 2[7 + ( 7 x 6) / 2 + ( 7 x 6 x 5) / 6 ] + 1

⇒ 2 [ 7 + 21 + 35 ] + 1

= 127.