Question

Expansion of (41)3

68923

68921
68927

Answer 1

Answer:

41×41×41 = 68921

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Answer 2

Expansion of (41)3

68923

68921

6892731/4+71/6)144

general term=144Cr341(144−r)71/6(r)

=144Cr336−4r76r

For rational terms

r=LCM(4,6)=12

r=0,12,24,36,.....144

AP→

144=0+(n−1)12

n−1=2144=12

n=13

∴ 13 rational term.