7.Binomial Theorem
easy

જો ${(1 + x)^{18}}$ ના વિસ્તરણમાં ${(2r + 4)^{th}}$ અને ${(r - 2)^{th}}$ ના સહગુણકો સમાન હોય તો $r  = $. . . .

A

$12$

B

$10$

C

$8$

D

$6$

Solution

(d) $^{18}{C_{2r + 3}}{ = ^{18}}{C_{r – 3}}\,\,\, \Rightarrow 2r + 3 + r – 3 = 18 \Rightarrow r = 6$

Standard 11
Mathematics

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