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05-09-2018
Mathematics

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Find the fourth term of the expansion (5 + 3y)^5

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Аноним Аноним

10-09-2018

(r+1)the term of (a + b)^n

= nCr a^(n-r) b^r

So 4th term = (3 + 1)th term) of (5 + 3y)^5=

5C3 (5^(5-3) (3y)^3

= 10* 25 * 27y^3

= 6750 y^3 answer

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