explain step by step and this is a class 9 question so explain according to class 9.
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i start with examples
(p+q)²= p²+2pq+q²
in this coefficients are 1,2,1
sum of these = 1+2+1 = 4 = 2² = 2^power of binomial
(p+q)³ = p³+3p²q+3pq²+q³
coefficients are 1,3,3,1
sum = 1+3+3+1 = 8 = 2³ = 2^power of binomial
in our question
(3y-1)^7
a0+a1+a2+a3 +.....+a7 = 2^7
= 128
(p+q)²= p²+2pq+q²
in this coefficients are 1,2,1
sum of these = 1+2+1 = 4 = 2² = 2^power of binomial
(p+q)³ = p³+3p²q+3pq²+q³
coefficients are 1,3,3,1
sum = 1+3+3+1 = 8 = 2³ = 2^power of binomial
in our question
(3y-1)^7
a0+a1+a2+a3 +.....+a7 = 2^7
= 128
Asmit7:
i want to marked ur ans as brainliest but how
my sir said that it is a class 11 type question
it is very simple
sum of the coefficients of the binomial expansion = 2 ^ binomial power
don't u find brainliast on top of the solution
no
ok , after some time u get a pop up, mark brainliast
ok
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