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Sir please tell me what formula used in second step. Sir help me in second step 
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Asked by sanjaysingh.srct | 31 Jul, 2019, 16:00: PM
answered-by-expert Expert Answer
Binomial expansion has been used in the second term which is given by
left parenthesis a plus b right parenthesis to the power of n equals 1 plus C presubscript 1 presuperscript n space a to the power of n minus 1 end exponent b plus C presubscript 2 presuperscript n space a to the power of n minus 2 end exponent b squared plus... plus C presubscript n presuperscript n space b to the power of n F o r space e a c h space b r a c k e t comma space t h i s space f o r m u l a space i s space u s e d
Answered by Renu Varma | 01 Aug, 2019, 10:03: AM

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