For Binomial distribution, mean =np and variance =npq ∴np=2 and npq=1 [given] ⇒q=1/2 and p+q=1⇒∴​p=1/2n=4,p=q=1/2​Now, P(X>1)=1−{P(X=0)+P(X=1)}=1−4C0​(21​)0(21​)4−4C1​(21​)1(21​)3=1−161​−164​=1611​