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$How many terms are there in the expansion of (4 x + 7 y)^{10} + (4 x - 7 y)^{10} ?$

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detailed solution

Correct option is A

(4x+7y)10+(4x-7y)10=(4x)10+C1 10(4x)9(7y)+C2 10(4x)8(7y)2+…+(7y)10-(4x)10-C1 10(4x)9(7y)+C2 10(4x)8(7y)2+…+(7y)10=2C 101 (4x)9(7y)+C3 10(4x)7+C5 10(4x)8(7y)2+..+(7y)10 Therefore, required number of terms =5 .

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How many terms are there in the expansion of (4x+7y)10+(4x-7y)10?

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$How many terms are there in the expansion of (4 x + 7 y)^{10} + (4 x - 7 y)^{10} ?$