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Maths-

General

Easy

Question

ⁿC_r + ²ⁿC_r+1 + ⁿC^r+2 is equal to (2 $less or equal than$ r $less or equal than$ n)

2 . ⁿC_r+2
ⁿ⁺¹C_r+1
ⁿ⁺²C_r+2
none of these

The correct answer is: ⁿ⁺²C_r+2

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